Solve for x
x=500
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0.8x=100+300
Add 300 to both sides.
0.8x=400
Add 100 and 300 to get 400.
x=\frac{400}{0.8}
Divide both sides by 0.8.
x=\frac{4000}{8}
Expand \frac{400}{0.8} by multiplying both numerator and the denominator by 10.
x=500
Divide 4000 by 8 to get 500.
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