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12\times \frac{1}{4}=4\times \frac{1}{12}\times 12x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 12x, the least common multiple of x,12.
\frac{12}{4}=4\times \frac{1}{12}\times 12x
Multiply 12 and \frac{1}{4} to get \frac{12}{4}.
3=4\times \frac{1}{12}\times 12x
Divide 12 by 4 to get 3.
3=\frac{4}{12}\times 12x
Multiply 4 and \frac{1}{12} to get \frac{4}{12}.
3=\frac{1}{3}\times 12x
Reduce the fraction \frac{4}{12} to lowest terms by extracting and canceling out 4.
3=\frac{12}{3}x
Multiply \frac{1}{3} and 12 to get \frac{12}{3}.
3=4x
Divide 12 by 3 to get 4.
4x=3
Swap sides so that all variable terms are on the left hand side.
x=\frac{3}{4}
Divide both sides by 4.