72+4+15a=31

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Solution for 72+4+15a=31 equation: 



72+4+15a=31

We move all terms to the left:

72+4+15a-(31)=0

We add all the numbers together, and all the variables

15a+45=0

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

15a=-45

a=-45/15

a=-3

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