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3a-15=2\left(6+a\right)
Use the distributive property to multiply 3 by a-5.
3a-15=12+2a
Use the distributive property to multiply 2 by 6+a.
3a-15-2a=12
Subtract 2a from both sides.
a-15=12
Combine 3a and -2a to get a.
a=12+15
Add 15 to both sides.
a=27
Add 12 and 15 to get 27.