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4\left(x-12\right)=3x
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,4.
4x-48=3x
Use the distributive property to multiply 4 by x-12.
4x-48-3x=0
Subtract 3x from both sides.
x-48=0
Combine 4x and -3x to get x.
x=48
Add 48 to both sides. Anything plus zero gives itself.