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-12=a+(-8)
We simplify the equation to the form, which is simple to understand
-12=a+(-8)
Remove unnecessary parentheses
-12=+a-8
We move all terms containing a to the left and all other terms to the right.
-1a=-8+12
We simplify left and right side of the equation.
-1a=+4
We divide both sides of the equation by -01 to get a.
a=-4
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