Question

можно пж ссылкой на ответы

Answer 1

1)
$6x = 28 - x \\ 6x + x = 28 \\ 7x = 28 \\ x = \frac{28}{7} \\ x = 4$
2)
$9x - 26 = 30 - 5x \\ 9x + 5x = 30 + 26 \\ 14x = 56 \\ x = 4$
3)
$7 - 3x = 6x - 56 \\ - 3x - 6x = - 56 - 7 \\ - 9x = - 63 \\ x = 7$
4)
$0.9x - 7.4 = - 0.4x + 4.3 \\ 0.9x + 0.4x = 7.4 + 4.3 \\ 1.3x = 11.7 \\ x = \frac{117}{13} \\ x = 9$
5)
$5.8 - 1.6x = 0.3x - 1.8 \\ - 1.6x - 0.3x = - 1.8 - 5.8 \\ - 1.9x = - 7.6 \\ x = 4$
6)
$\frac{3}{8} x + 19 = \frac{7}{12} x + 24 \\ \frac{9}{24} x - \frac{14}{24} x = 24 - 19 \\ - \frac{5}{24}x = 5 \\ x = \frac{5}{1} \div ( - \frac{5}{24} ) \\ x = - ( \frac{5}{1} \times \frac{24}{5} ) \\ x = - 24$
1.
$5(x - 4) = x + 8 \\ 5x - 20 = x + 8 \\ 5x - x = 20 + 8 \\ 4x = 28 \\ x = 7$
2.
$9 - 7(x + 3) = 5 - 6x \\ 9 - 7x - 21 = 5 - 6x \\ - 7x + 6x = - 9 + 21 + 5 \\ - x = 17 \\ x = - 17$
3.
$(7x + 9) - (11x - 7) = 8 \\ 7x + 9 - 11x + 7 = 8 \\ 7x - 11x = 8 - 9 - 7 \\ - 4x = - 8 \\ x = 2$
4.
$19.6 + y = 7(1.2 - y) \\ 19.6 + y = 8.4 - 7y \\ y + 7y = 8.4 - 19.6 \\ 8y = - 11.2 \\ y = - 1.4$
5.
$0.4(6 - 4y) = 0.5(7 - 3y) - 1.9 \\ 2.4 - 1.6y = 3.5 - 1.5y - 1.9 \\ - 1.6y + 1.5y = - 2.4 + 3.5 - 1.9 \\ - 0.1y = - 0.8 \\ y = 8$
6.
$\frac{3}{4} ( \frac{1}{6} x - \frac{1}{3}) = 2x - 11 \frac{1}{2} \\ \frac{1}{8}x - \frac{1}{4} = \frac{2}{1} x - \frac{23}{2} \\ \frac{1}{8} x - \frac{16}{8} x = \frac{1}{4} - \frac{46}{4} \\ - \frac{15}{8} x = - \frac{45}{4} \\ x = \frac{45}{4} \times \frac{8}{15} \\ x = 6$