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4\times 5=2\times 5+4x\left(-\frac{1}{4}\right)
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,2x,4.
20=2\times 5+4x\left(-\frac{1}{4}\right)
Multiply 4 and 5 to get 20.
20=10+4x\left(-\frac{1}{4}\right)
Multiply 2 and 5 to get 10.
20=10-x
Multiply 4 and -\frac{1}{4} to get -1.
10-x=20
Swap sides so that all variable terms are on the left hand side.
-x=20-10
Subtract 10 from both sides.
-x=10
Subtract 10 from 20 to get 10.
x=-10
Multiply both sides by -1.