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60\times 3030-4x\times 30=x\times 15
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 60x, the least common multiple of x,15,60.
181800-4x\times 30=x\times 15
Multiply 60 and 3030 to get 181800.
181800-120x=x\times 15
Multiply 4 and 30 to get 120.
181800-120x-x\times 15=0
Subtract x\times 15 from both sides.
181800-120x-15x=0
Multiply -1 and 15 to get -15.
181800-135x=0
Combine -120x and -15x to get -135x.
-135x=-181800
Subtract 181800 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-181800}{-135}
Divide both sides by -135.
x=\frac{4040}{3}
Reduce the fraction \frac{-181800}{-135} to lowest terms by extracting and canceling out -45.