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5x+80-2x+1=150
Use the distributive property to multiply 2 by 40-x.
3x+80+1=150
Combine 5x and -2x to get 3x.
3x+81=150
Add 80 and 1 to get 81.
3x=150-81
Subtract 81 from both sides.
3x=69
Subtract 81 from 150 to get 69.
x=\frac{69}{3}
Divide both sides by 3.
x=23
Divide 69 by 3 to get 23.