Question

Решите уравнения :


-5(3 - x) = 2x + 7

9-2(3 - 4x) = -2x+1

9+2(3 - 4x) = 3x - 3

9-2(3 - 4x) = 2x + 1

Answer 1

1. -15+5x=2x+7 ⇒ 3x=22 ⇒ x= $\frac{22}{3}$
2. 9-6+8x=-2x+1 ⇒ 10x=-2⇒x=-5
3. 9+6-8x=3x-3 ⇒ -11x=6 ⇒ x= $\frac{6}{11}$
4. 9-6+8x=2x+1 ⇒6x=-2⇒x= - $\frac{1}{3}$