a) 4x+1+2(x-5)=5(x+1)
4x+1+2*x+2*5=5*x+5*1
4x+1+2x+10=5x+5
4x+2x-5x=-1-10+5
x=-6
b) 3(2x+3)-2(3x+2)=-3(x+2)+2
3*2x+3*3-2*3x+2*2=-3*x+-3*2+2
6x+9-6x+4=-3x+(-6)+2
6x-6x+3x=-9-4-6+2
3x=-17
x=-17/3
c) x-15+3(x+1)=3(2x+3)+7(x+4)+8
x-15+3*x+3*1=3*2x+3*3+7*x+7*4+8
x-15+3x+3=6x+9+7x+28+8
x+3x-6x-7x=15-3+9+28+8
-9x=57
x=57/-9
x=19/-3