Question

rezolvati ecuatiile, x apartine Z
1. 2(2x+1)-4(x+3)=5-3(2x+1)
2. 3x+5-2(x+2)=8-3(1-x)

Answer 1

$\displaystyle a).2(2x+1)-4(x+3)=5-3(2x+1) \\ 4x+2-4x-12=5-6x-3 \\ 4x-4x+6x=5-3-2+12 \\ 6x=12 \\ x= \frac{12}{6} \\ x=2 \\ b).3x+5-2(x+2)=8-3(1-x) \\ 3x+5-2x-4=8-3+3x \\ 3x-2x-3x=8-3-5+4 \\ -2x=4 \\ x=- \frac{4}{2} \\ x=-2$