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4\times 80\left(25-x\right)+3\times 60x=480
Multiply both sides of the equation by 240, the least common multiple of 60,80.
320\left(25-x\right)+3\times 60x=480
Multiply 4 and 80 to get 320.
8000-320x+3\times 60x=480
Use the distributive property to multiply 320 by 25-x.
8000-320x+180x=480
Multiply 3 and 60 to get 180.
8000-140x=480
Combine -320x and 180x to get -140x.
-140x=480-8000
Subtract 8000 from both sides.
-140x=-7520
Subtract 8000 from 480 to get -7520.
x=\frac{-7520}{-140}
Divide both sides by -140.
x=\frac{376}{7}
Reduce the fraction \frac{-7520}{-140} to lowest terms by extracting and canceling out -20.