Question

Rezolvati in multimea numerelor intregi ecuatiile:

3(x-2)-4(2x+5)=13x+10

-3(2x-5)+(7x-9)= -5x-2(9-3x)+24

5x-7(-2-5x)=13(1-2x)-113

Answer 1

3(x-2)-4(2x+5)=13x+10
3x-6-8x-20=13x+10
-5x-26=13x+10
-18x=36=>x=(-2)

-3(2x-5)+(7x-9)= -5x-2(9-3x)+24
-6x+15+7x-9=-5x-18+6x+24
x+6=x+6=>x=0

5x-7(-2-5x)=13(1-2x)-113
5x+14+35x=13-26x-113
40x+14=-26x-100
66x=-114=>x=(-114/66)=(-57/33)=(-29/11)