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3x+10+20=180
Combine x and 2x to get 3x.
3x+30=180
Add 10 and 20 to get 30.
3x=180-30
Subtract 30 from both sides.
3x=150
Subtract 30 from 180 to get 150.
x=\frac{150}{3}
Divide both sides by 3.
x=50
Divide 150 by 3 to get 50.