Solve for x
x=1500
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300+0.8x-x=0
Subtract x from both sides.
300-0.2x=0
Combine 0.8x and -x to get -0.2x.
-0.2x=-300
Subtract 300 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-300}{-0.2}
Divide both sides by -0.2.
x=\frac{-3000}{-2}
Expand \frac{-300}{-0.2} by multiplying both numerator and the denominator by 10.
x=1500
Divide -3000 by -2 to get 1500.
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