Solve for x
x=3000
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480-0.2x+0.3x=780
Add 0.3x to both sides.
480+0.1x=780
Combine -0.2x and 0.3x to get 0.1x.
0.1x=780-480
Subtract 480 from both sides.
0.1x=300
Subtract 480 from 780 to get 300.
x=\frac{300}{0.1}
Divide both sides by 0.1.
x=3000
Expand \frac{300}{0.1} by multiplying both numerator and the denominator by 10. Anything divided by one gives itself.
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