1.
3x=3.6
x=3.6÷3
x=1.2
2.
x+2.5=10
x=10-2.5
x=7.5
3.
x-18=40
x=40+18
x=58
4.
2y+7=91
2y=91-7
y=84÷2
y=42
5.
8m÷2=16
8m=16*2
m=32÷8
m=4