Question

Rezolvați ecuațiile :

2[15+3(x-1)] = 4(x+7)
4(x+5)-3(x-3)=2(x+15)
5(x-7)-2x = x-41

Answer 1

1. 2[15+3(x-1)] = 4(x+7)
    2(15+3+x+1=4+x+7
    2(18+x+1)=11x
    2+19x=11x
    2=19x-11x
    2=8x
    x=8:2
   x= 4


2. 4(x+5)-3(x-3)=2(x+15)
    4+5x-3+3x=2+15x
    1+8x=2+15x
    15x-5=2-1
    10x=1
     x=10


3. 5(x-7)-2x=x-41
    5-7x-2x=x-41
    5-5x=x-41
    5x-x=41=5
    4x=36
    x=36:4
    x=9