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3\times 3x\times \frac{2}{5}=5x+6
Multiply both sides of the equation by 15, the least common multiple of 5,3.
9x\times \frac{2}{5}=5x+6
Multiply 3 and 3 to get 9.
\frac{9\times 2}{5}x=5x+6
Express 9\times \frac{2}{5} as a single fraction.
\frac{18}{5}x=5x+6
Multiply 9 and 2 to get 18.
\frac{18}{5}x-5x=6
Subtract 5x from both sides.
-\frac{7}{5}x=6
Combine \frac{18}{5}x and -5x to get -\frac{7}{5}x.
x=6\left(-\frac{5}{7}\right)
Multiply both sides by -\frac{5}{7}, the reciprocal of -\frac{7}{5}.
x=\frac{6\left(-5\right)}{7}
Express 6\left(-\frac{5}{7}\right) as a single fraction.
x=\frac{-30}{7}
Multiply 6 and -5 to get -30.
x=-\frac{30}{7}
Fraction \frac{-30}{7} can be rewritten as -\frac{30}{7} by extracting the negative sign.