1. x+3=7
x=7-3
x=4
2. 5x-3=17
5x=17+3
5x=20
x=20/5
3. 2x-18=3x+2x-6
2x-3x-2x=-6+18
-3x=12
-x=12/3
x=-4
4. 10x+36-20x=16
10x-20x=16-36
-10x=-20
x=2
5. 7y+5,5=2y
7y-2y=-5.5
5y=-5.5 |:5
y=-1.1
1. x+3=7
x=7-3
x=4
2. 5x-3=17
5x=17+3
5x=20
x=20/5
x=4
3. 2x-18=3x+2x-6
2x-3x-2x=-6+18
-3x=12
-x=12/3
x=-4
4. 10x+36-20x=16
10x-20x=16-36
-10x=-20
x=2
5. 7y+5,5=2y
7y-2y=-5.5
5y=-5.5 |:5
y=-1.1