15+5a=7-

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Solution for 15+5a=7- equation: 



15+5a=7-

We move all terms to the left:

15+5a-(7-)=0

We add all the numbers together, and all the variables

5a+15-0=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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