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3\left(a+7\right)=2\left(8a-5\right)
Variable a cannot be equal to \frac{5}{8} since division by zero is not defined. Multiply both sides of the equation by 3\left(8a-5\right), the least common multiple of 8a-5,3.
3a+21=2\left(8a-5\right)
Use the distributive property to multiply 3 by a+7.
3a+21=16a-10
Use the distributive property to multiply 2 by 8a-5.
3a+21-16a=-10
Subtract 16a from both sides.
-13a+21=-10
Combine 3a and -16a to get -13a.
-13a=-10-21
Subtract 21 from both sides.
-13a=-31
Subtract 21 from -10 to get -31.
a=\frac{-31}{-13}
Divide both sides by -13.
a=\frac{31}{13}
Fraction \frac{-31}{-13} can be simplified to \frac{31}{13} by removing the negative sign from both the numerator and the denominator.