15+5a=40

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Solution for 15+5a=40 equation: 



15+5a=40

We move all terms to the left:

15+5a-(40)=0

We add all the numbers together, and all the variables

5a-25=0

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

5a=25

a=25/5

a=5

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