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-6=7-(8-a)
We simplify the equation to the form, which is simple to understand
-6=7-(8-a)
Remove unnecessary parentheses
-6=7-8+1a
We move all terms containing a to the left and all other terms to the right.
-1a=+7-8+6
We simplify left and right side of the equation.
-1a=+5
We divide both sides of the equation by -01 to get a.
a=-5
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