Solve for x
x=30
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13x+10=400
Add 8 and 5 to get 13.
13x=400-10
Subtract 10 from both sides.
13x=390
Subtract 10 from 400 to get 390.
x=\frac{390}{13}
Divide both sides by 13.
x=30
Divide 390 by 13 to get 30.
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