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-8=-(2+a)
We simplify the equation to the form, which is simple to understand
-8=-(2+a)
Remove unnecessary parentheses
-8=-2-1a
We move all terms containing a to the left and all other terms to the right.
+1a=-2+8
We simplify left and right side of the equation.
+1a=+6
We divide both sides of the equation by 01 to get a.
a=6
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