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30x\times \frac{1}{10}+30=5x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 30x, the least common multiple of 10,x,6.
\frac{30}{10}x+30=5x
Multiply 30 and \frac{1}{10} to get \frac{30}{10}.
3x+30=5x
Divide 30 by 10 to get 3.
3x+30-5x=0
Subtract 5x from both sides.
-2x+30=0
Combine 3x and -5x to get -2x.
-2x=-30
Subtract 30 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-30}{-2}
Divide both sides by -2.
x=15
Divide -30 by -2 to get 15.