5-2.5a=-15

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Solution for 5-2.5a=-15 equation: 



5-2.5a=-15

We move all terms to the left:

5-2.5a-(-15)=0

We add all the numbers together, and all the variables

-2.5a+20=0

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

-2.5a=-20

a=-20/-2.5

a=+8

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