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3\left(3a-7\right)=4\left(4a+5\right)
Multiply both sides of the equation by 12, the least common multiple of 4,3.
9a-21=4\left(4a+5\right)
Use the distributive property to multiply 3 by 3a-7.
9a-21=16a+20
Use the distributive property to multiply 4 by 4a+5.
9a-21-16a=20
Subtract 16a from both sides.
-7a-21=20
Combine 9a and -16a to get -7a.
-7a=20+21
Add 21 to both sides.
-7a=41
Add 20 and 21 to get 41.
a=\frac{41}{-7}
Divide both sides by -7.
a=-\frac{41}{7}
Fraction \frac{41}{-7} can be rewritten as -\frac{41}{7} by extracting the negative sign.