Solve for a
a=19
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a+12-a\times 2=-7
Subtract a\times 2 from both sides.
-a+12=-7
Combine a and -a\times 2 to get -a.
-a=-7-12
Subtract 12 from both sides.
-a=-19
Subtract 12 from -7 to get -19.
a=19
Multiply both sides by -1.
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