Solve for x
x=600
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9+0.1x-0.08x=21
Subtract 0.08x from both sides.
9+0.02x=21
Combine 0.1x and -0.08x to get 0.02x.
0.02x=21-9
Subtract 9 from both sides.
0.02x=12
Subtract 9 from 21 to get 12.
x=\frac{12}{0.02}
Divide both sides by 0.02.
x=\frac{1200}{2}
Expand \frac{12}{0.02} by multiplying both numerator and the denominator by 100.
x=600
Divide 1200 by 2 to get 600.
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