A(10)=15+(10-1)(-5)

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Solution for A(10)=15+(10-1)(-5) equation:


a(10)=15+(10-1)(-5)

We simplify the equation to the form, which is simple to understand 
a(10)=15+(10-1)*(-5)

Reorder the terms in parentheses
+(+10a)=15+(+9)*(-5)

Remove unnecessary parentheses
+10a=+15+(+9+)+*(-5+)

Reorder the terms in parentheses
multiplication of parentheses
+10a=15+(-45)



Remove unnecessary parentheses
+10a=+15-45

We move all terms containing a to the left and all other terms to the right. 
+10a=+15-45

We simplify left and right side of the equation. 
+10a=-30

We divide both sides of the equation by 10 to get a. 
a=-3

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