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120\times 12=15x\times 12\times \frac{20}{30}\times \frac{1}{2}
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 120x, the least common multiple of x,8,30,2.
1440=15x\times 12\times \frac{20}{30}\times \frac{1}{2}
Multiply 120 and 12 to get 1440.
1440=180x\times \frac{20}{30}\times \frac{1}{2}
Multiply 15 and 12 to get 180.
1440=180x\times \frac{2}{3}\times \frac{1}{2}
Reduce the fraction \frac{20}{30} to lowest terms by extracting and canceling out 10.
1440=\frac{180\times 2}{3}x\times \frac{1}{2}
Express 180\times \frac{2}{3} as a single fraction.
1440=\frac{360}{3}x\times \frac{1}{2}
Multiply 180 and 2 to get 360.
1440=120x\times \frac{1}{2}
Divide 360 by 3 to get 120.
1440=\frac{120}{2}x
Multiply 120 and \frac{1}{2} to get \frac{120}{2}.
1440=60x
Divide 120 by 2 to get 60.
60x=1440
Swap sides so that all variable terms are on the left hand side.
x=\frac{1440}{60}
Divide both sides by 60.
x=24
Divide 1440 by 60 to get 24.