Solve for x
x=40
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180=4x-20+x
Combine 3x and x to get 4x.
180=5x-20
Combine 4x and x to get 5x.
5x-20=180
Swap sides so that all variable terms are on the left hand side.
5x=180+20
Add 20 to both sides.
5x=200
Add 180 and 20 to get 200.
x=\frac{200}{5}
Divide both sides by 5.
x=40
Divide 200 by 5 to get 40.
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