1) x/2=9
x=9*2
x=18
x/2=16
x=16*2
x=32
-x/2=-9
-X=-9*2
-x=-18/*(-1)
X=18
3x/2=75
3x=75*2
3x=150
x=150/3
X=50
5x/2=45
5x=45*2
5x=90
x=90/5
X=18
(x/2)+8=9
x/2=9-8
x/2=1
x=1/2
X=0,5
(X/2)-10=26
X/2=26+10
X/2=36
X=36*2
X=72
(4x/2)+11=47
4x/2=47-11
4x/2=36
4x=36*2
4x=72
X=72/4
X=18