(3*(x+2y)-y=27 (4*(x+y)-3x=23 (5x-2*(y+4)=0 (6*(2x+3)-y=41 (2x+3*(x+y)=11 (7*(x+3y)-6x=-59

1)
3x+6y-y=27
4x+4y-3x=23

3x+5y=27
x+4y=23

x=23-4y
3(23-4y)+5y=27
69-12y+5y=27
-7y=27-69=-42
y=6
x=23-4*6=-1

2)
5x-2y=8
12x+18-y=41

5x-2y=8
12x-y=23

y=12x-23
5x-2(12x-23)=8
5x-24x+46=8
-19x=8-46=-38
x=2
y=12*2-23=1

3)
2x+3x+3y=11
7x+21y-6x=-59

5x+3y=11
x+21y=-59

x=-59-21y
5(-59-21y)+3y=11
-295-105y+3y=11
-102y=306
y=-3
x=-59-21*(-3)=-59+63=4