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4\times 5=4x\times \frac{1}{2}+4x\times \frac{3}{4}
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,2,4.
20=4x\times \frac{1}{2}+4x\times \frac{3}{4}
Multiply 4 and 5 to get 20.
20=\frac{4}{2}x+4x\times \frac{3}{4}
Multiply 4 and \frac{1}{2} to get \frac{4}{2}.
20=2x+4x\times \frac{3}{4}
Divide 4 by 2 to get 2.
20=2x+3x
Cancel out 4 and 4.
20=5x
Combine 2x and 3x to get 5x.
5x=20
Swap sides so that all variable terms are on the left hand side.
x=\frac{20}{5}
Divide both sides by 5.
x=4
Divide 20 by 5 to get 4.