Solve for a
a=180
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-a-80=-240-20
Multiply both sides of the equation by 10.
-a-80=-260
Subtract 20 from -240 to get -260.
-a=-260+80
Add 80 to both sides.
-a=-180
Add -260 and 80 to get -180.
a=180
Multiply both sides by -1.
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