15a+8-0.4a=-7

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Solution for 15a+8-0.4a=-7 equation: 



15a+8-0.4a=-7

We move all terms to the left:

15a+8-0.4a-(-7)=0

We add all the numbers together, and all the variables

14.6a+15=0

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

14.6a=-15

a=-15/14.6

a=-1+0.4/14.6

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