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2.5(2.5a+10)=0
We simplify the equation to the form, which is simple to understand
2.5(2.5a+10)=0
Reorder the terms in parentheses
+(+6.25a+25)=0
Remove unnecessary parentheses
+6.25a+25=0
We move all terms containing a to the left and all other terms to the right.
+6.25a=0-25
We simplify left and right side of the equation.
+6.25a=-25
We divide both sides of the equation by 6.25 to get a.
a=-4
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