Solve for a

a=27

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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.