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2a+2(-2a-5)=0
We simplify the equation to the form, which is simple to understand
2a+2(-2a-5)=0
Reorder the terms in parentheses
2a+(-4a-10)=0
Remove unnecessary parentheses
+2a-4a-10=0
We move all terms containing a to the left and all other terms to the right.
+2a-4a=0+10
We simplify left and right side of the equation.
-2a=+10
We divide both sides of the equation by -2 to get a.
a=-5
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