Solve for x
x=120
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3x+90=450
Swap sides so that all variable terms are on the left hand side.
3x=450-90
Subtract 90 from both sides.
3x=360
Subtract 90 from 450 to get 360.
x=\frac{360}{3}
Divide both sides by 3.
x=120
Divide 360 by 3 to get 120.
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