30=(-3)(5)-12.5a

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Solution for 30=(-3)(5)-12.5a equation: 



30=(-3)(5)-12.5a

We move all terms to the left:

30-((-3)(5)-12.5a)=0



We calculate terms in parentheses: -((-3)5-12.5a), so:

(-3)5-12.5a

determiningTheFunctionDomain
-12.5a+(-3)5

We add all the numbers together, and all the variables

-12.5a-15

Back to the equation:

-(-12.5a-15)



We get rid of parentheses

12.5a+15+30=0

We add all the numbers together, and all the variables

12.5a+45=0

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

12.5a=-45

a=-45/12.5

a=-3+5/8.3333333333333

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