Solve for x
x=320
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256=0.8x
Combine x and -0.2x to get 0.8x.
0.8x=256
Swap sides so that all variable terms are on the left hand side.
x=\frac{256}{0.8}
Divide both sides by 0.8.
x=\frac{2560}{8}
Expand \frac{256}{0.8} by multiplying both numerator and the denominator by 10.
x=320
Divide 2560 by 8 to get 320.
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