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15=0.9x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
0.9x=15
Swap sides so that all variable terms are on the left hand side.
x=\frac{15}{0.9}
Divide both sides by 0.9.
x=\frac{150}{9}
Expand \frac{15}{0.9} by multiplying both numerator and the denominator by 10.
x=\frac{50}{3}
Reduce the fraction \frac{150}{9} to lowest terms by extracting and canceling out 3.