Solve for a
a=-20
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3a+18=2\left(a-1\right)
Use the distributive property to multiply 3 by a+6.
3a+18=2a-2
Use the distributive property to multiply 2 by a-1.
3a+18-2a=-2
Subtract 2a from both sides.
a+18=-2
Combine 3a and -2a to get a.
a=-2-18
Subtract 18 from both sides.
a=-20
Subtract 18 from -2 to get -20.
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