a(13)=5-2(15)

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Solution for a(13)=5-2(15) equation:


a(13)=5-2(15)

We simplify the equation to the form, which is simple to understand 
a(13)=5-2(15)

Reorder the terms in parentheses
+(+13a)=5-2*(15)

Remove unnecessary parentheses
+13a=+5-2+*(+15+)

Reorder the terms in parentheses
+13a=5+(-30)

Remove unnecessary parentheses
+13a=+5-30

We move all terms containing a to the left and all other terms to the right. 
+13a=+5-30

We simplify left and right side of the equation. 
+13a=-25

We divide both sides of the equation by 13 to get a. 
a=-1.92307692308

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