Question

rezolvati in r
7x+11=4
3x+7=x-2
8x-(3x+1)=9

Answer 1

7x=4-11
7x=-7
x=-1

3x-x=-2-7
2x=-9
x=9/2

8x-3x+-1=9
5x=9+1
5x=10
x=2

Answer 2

$7x + 11 = 4 ==> 7x = 4-11 ==> 7x = -7 ==> x=-1 \\ 3x+7=x-2 ==> 3x-x=-2-7 ==> 2x=-9 ==> x= -\frac{9}{2} \\ 8x-(3x+1)=9 ==> 8x-3x-1=9 ==> 5x=10 ==> x=2$