Question

Помогите плиз решить уравнение
а) 4x+4=-12 б) 7x-6= x+12
в) 2•(y+3) =21 г) 3•(3x-1) -x=13
д) 3•(y+3) =20 е) 2•(3x-1) -x=13
ж) 7-3•(2x+1) =10 з) 3•(5x-7) +5=3•(2x+3)

Answer 1

2. $4x + 4 = - 12 \\ 4x = - 16 \\ x = - 4$
3. $7x - 6 = x + 12 \\ 6x = 18 \\ x = 3$
4. $2(y + 3) = 21 \\ 2y + 6 = 21 \\ 2y = 15 \\ y = 7.5$
5. $3(3x - 1) - x = 13 \\ 9x - 3 - x = 13 \\ 8x = 16 \\ x = 2$
6. $3(y + 3) = 20 \\ 3y + 9 = 20 \\ 3y = 11 \\ y = \ \frac{11}{3} \\ y = 3 \frac{2}{3}$
7. $2(3x - 1) - x = 13 \\ 6x - 2 - x = 13 \\ 5x = 15 \\ x = 3$
8. $7 - 3(2x + 1) = 10 \\ 7 - 6x - 3 = 10 \\ - 6x = 6 \\ x = - 1$
9. $3(5x - 7) + 5 = 3(2x + 3) \\ 15x - 21 + 5 = 6x + 9 \\ 9x = 25 \\ x = \frac{25}{9} \\ x = 2 \frac{7}{9}$