2x+5=2(-x+1)+11
2x+5=-2x+2+11
2x+2x=13-5
4x=8:4
x=2
6y-3(y-1)=4+5y
6y-3y+3=4+5y
3y-5y=4-3
-2y=1:(-2)
y=-0,5
4(x-1)-3=-(x+7)+8
4x-4-3=-x-7+8
4x+x=1+7
5x=8:5
x=1,6
-2(5x-9)+2=15+7(-x+2)
-10x+18+2=15-7x+14
-10x+7x=29-20
-3x=9:(-3)
x=-3
12+4(x-3)-2x=(5-3x)+9
11+4x-12-2x=5-3x+9
2x+3x=14+1
5x=15:5
x=3