Solve for a
a=-6
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6-2a=18
Add 1 and 5 to get 6.
-2a=18-6
Subtract 6 from both sides.
-2a=12
Subtract 6 from 18 to get 12.
a=\frac{12}{-2}
Divide both sides by -2.
a=-6
Divide 12 by -2 to get -6.
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