(y-12)+20=40
y-12=40-20
y-12=20
y=20+12
y=32
(a+6)*3=60
a+6=60/3
a+6=20
a=20-6
a=14
(20+m)/2=26
20+m=26*2
20+m=52
m=52-20
m=32
(45-n)*3=12*2
45-n=24*3
45-n=72
n=72-45
n=27
(160+x)-40=300
160+x=300+40
x=340-160
x=180
225/(c+5)=15
c+5=15*225
c=3375-5
c=3370