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5\times \frac{15-x}{2}=3\times \frac{15x+2x}{2}
Multiply both sides of the equation by 45, the least common multiple of 9,15.
\frac{5\left(15-x\right)}{2}=3\times \frac{15x+2x}{2}
Express 5\times \frac{15-x}{2} as a single fraction.
\frac{5\left(15-x\right)}{2}=3\times \frac{17x}{2}
Combine 15x and 2x to get 17x.
\frac{5\left(15-x\right)}{2}=\frac{3\times 17x}{2}
Express 3\times \frac{17x}{2} as a single fraction.
\frac{75-5x}{2}=\frac{3\times 17x}{2}
Use the distributive property to multiply 5 by 15-x.
\frac{75}{2}-\frac{5}{2}x=\frac{3\times 17x}{2}
Divide each term of 75-5x by 2 to get \frac{75}{2}-\frac{5}{2}x.
\frac{75}{2}-\frac{5}{2}x=\frac{51x}{2}
Multiply 3 and 17 to get 51.
\frac{75}{2}-\frac{5}{2}x-\frac{51x}{2}=0
Subtract \frac{51x}{2} from both sides.
\frac{75+51x}{2}-\frac{5}{2}x=0
Since \frac{75}{2} and \frac{51x}{2} have the same denominator, add them by adding their numerators.
75+51x-5x=0
Multiply both sides of the equation by 2.
-5x+51x+75=0
Reorder the terms.
46x+75=0
Combine -5x and 51x to get 46x.
46x=-75
Subtract 75 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-75}{46}
Divide both sides by 46.
x=-\frac{75}{46}
Fraction \frac{-75}{46} can be rewritten as -\frac{75}{46} by extracting the negative sign.