Solve for x
x=16
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10+5x=90
Swap sides so that all variable terms are on the left hand side.
5x=90-10
Subtract 10 from both sides.
5x=80
Subtract 10 from 90 to get 80.
x=\frac{80}{5}
Divide both sides by 5.
x=16
Divide 80 by 5 to get 16.
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