Question

Решите 3 уравнения заранее спасибо:
1) 4x+7=3(x-1)
2) 3(x-1)+4(x+1)=6(x-2)
3) 3(x-1.1)+4(1.2x+2)=7.3x+0.7

Answer 1

$4x + 7 = 3(x - 1) \\ 4x + 7 = 3x - 3 \\ 4x - 3x = - 3 - 7 \\ x = - 10$
$3(x - 1) + 4(x + 1) = 6(x - 2) \\ 3x - 3 + 4x + 4 = 6x - 12 \\ 7x + 1 = 6x - 12 \\ 7x - 6x = - 12 - 1 \\ x = - 13$
$3(x - 1.1) + 4(1.2x + 2) = 7.3x + 0.7 \\ 3x - 3.3 + 4.8x + 8 = 7.3x + 0.7 \\ 7.8x + 4.7 = 7.3x + 0.7 \\ 7.8x - 7.3x = 0.7 - 4.7 \\ 0.5x = - 4 \\ x = - 4 \div 0.5 \\ x = - 40 \div 5 \\ x = - 8$