Solve for x
x=64
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5x=4\times 80
Multiply both sides of the equation by 20, the least common multiple of 4,5.
5x=320
Multiply 4 and 80 to get 320.
x=\frac{320}{5}
Divide both sides by 5.
x=64
Divide 320 by 5 to get 64.
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