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2\left(a+2\right)=7\left(a-3\right)
Multiply both sides of the equation by 14, the least common multiple of 7,2.
2a+4=7\left(a-3\right)
Use the distributive property to multiply 2 by a+2.
2a+4=7a-21
Use the distributive property to multiply 7 by a-3.
2a+4-7a=-21
Subtract 7a from both sides.
-5a+4=-21
Combine 2a and -7a to get -5a.
-5a=-21-4
Subtract 4 from both sides.
-5a=-25
Subtract 4 from -21 to get -25.
a=\frac{-25}{-5}
Divide both sides by -5.
a=5
Divide -25 by -5 to get 5.