(2.5+8.5a)=-28.5

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Solution for (2.5+8.5a)=-28.5 equation: 



(2.5+8.5a)=-28.5

We move all terms to the left:

(2.5+8.5a)-(-28.5)=0

We add all the numbers together, and all the variables

(8.5a+2.5)-(-28.5)=0

We add all the numbers together, and all the variables

(8.5a+2.5)+28.5=0

We get rid of parentheses

8.5a+2.5+28.5=0

We add all the numbers together, and all the variables

8.5a+31=0

We move all terms containing a to the left, all other terms to the right

8.5a=-31

a=-31/8.5

a=-3+3.66666666667/5.66666666667

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