Question

A. -15(x + 2) + 7(2x - 3)= -50

B. 3(x + 2) - 6(x - 5)= 2(5 - 2x)

Answer 1

a, \(-15\left(x+2\right)+7\left(2x-3\right)=-50\\ -15x-30+14x-21=-50\\ -x-51=-50\\ -x=-50+51\\ -x=1\\ \Rightarrow x=-1\)Vậy \(x=-1\)

b, \(3\left(x+2\right)-6\left(x-5\right)=2\left(5-2x\right)\\ 3x+6-6x+30=10-4x\\ -3x+36=10-4x\\ -3x+4x=10-36\\ x=-26\)Vậy \(x=-26\)

Answer 2

a, $-15\left(x+2\right)+7\left(2x-3\right)=-50-15x-30+14x-21=-50-x-51=-50-x=-50+51-x=1\Rightarrow x=-1$Vậy $x=-1$

b, $3\left(x+2\right)-6\left(x-5\right)=2\left(5-2x\right)3x+6-6x+30=10-4x-3x+36=10-4x-3x+4x=10-36x=-26$Vậy $x=-26$