50-11*x=28
11*x=50-28
11*x=22
x=22/11
x=2
x*50+100=700
x*50=700-100
x*50=600
x=600/50
x=12
87-x/4= 68
x/4=87-68
x/4=19
x=19*4
x=76
36+x*2=50
x*2=50-36
x*2=14
x=14/2
x=7
18*x+17=100-29
18*x+17= 71
18*x=71-17
18*x=54
x=54/18
x=3
79+44/x=80+3
79+44/x=83
44/x=83-79
44/x=4
x=44/4
x=11