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-(6-8a)-(13+7a)-3=-(8-5a)+(-a)+7
We simplify the equation to the form, which is simple to understand
-(6-8a)-(13+7a)-3=-(8-5a)+(-a)+7
Remove unnecessary parentheses
-6+8a-(13+7a)-3=-(8-5a)+(-a)+7
Remove unnecessary parentheses
-6+8a-13-7a-3=-(8-5a)+(-a)+7
Remove unnecessary parentheses
-6+8a-13-7a-3=-8+5a+(-a)+7
Remove unnecessary parentheses
-6+8a-13-7a-3=-8+5a-a+7
We move all terms containing a to the left and all other terms to the right.
+8a-7a-5a+1a=-8+7+6+13+3
We simplify left and right side of the equation.
-3a=+21
We divide both sides of the equation by -3 to get a.
a=-7
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