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180=2x+10+30
Combine x and x to get 2x.
180=2x+40
Add 10 and 30 to get 40.
2x+40=180
Swap sides so that all variable terms are on the left hand side.
2x=180-40
Subtract 40 from both sides.
2x=140
Subtract 40 from 180 to get 140.
x=\frac{140}{2}
Divide both sides by 2.
x=70
Divide 140 by 2 to get 70.