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4\times 5+x\times 8=20x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 4x, the least common multiple of x,4.
20+x\times 8=20x
Multiply 4 and 5 to get 20.
20+x\times 8-20x=0
Subtract 20x from both sides.
20-12x=0
Combine x\times 8 and -20x to get -12x.
-12x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-20}{-12}
Divide both sides by -12.
x=\frac{5}{3}
Reduce the fraction \frac{-20}{-12} to lowest terms by extracting and canceling out -4.