Solve for a
a=-10
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12-10=7+5+a
Add 7 and 5 to get 12.
2=7+5+a
Subtract 10 from 12 to get 2.
2=12+a
Add 7 and 5 to get 12.
12+a=2
Swap sides so that all variable terms are on the left hand side.
a=2-12
Subtract 12 from both sides.
a=-10
Subtract 12 from 2 to get -10.
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