Solve for x
x=100
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x=\frac{5}{4}\times 80
Multiply both sides by 80.
x=\frac{5\times 80}{4}
Express \frac{5}{4}\times 80 as a single fraction.
x=\frac{400}{4}
Multiply 5 and 80 to get 400.
x=100
Divide 400 by 4 to get 100.
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