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3\left(10-x\right)=2x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3.
30-3x=2x
Use the distributive property to multiply 3 by 10-x.
30-3x-2x=0
Subtract 2x from both sides.
30-5x=0
Combine -3x and -2x to get -5x.
-5x=-30
Subtract 30 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-30}{-5}
Divide both sides by -5.
x=6
Divide -30 by -5 to get 6.