Solve for x
x=220
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15x+900=4200
Swap sides so that all variable terms are on the left hand side.
15x=4200-900
Subtract 900 from both sides.
15x=3300
Subtract 900 from 4200 to get 3300.
x=\frac{3300}{15}
Divide both sides by 15.
x=220
Divide 3300 by 15 to get 220.
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