15=4a+-5

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Solution for 15=4a+-5 equation: 



15=4a+-5

We move all terms to the left:

15-(4a+-5)=0

We add all the numbers together, and all the variables

-(4a-5)+15=0

We get rid of parentheses

-4a+5+15=0

We add all the numbers together, and all the variables

-4a+20=0

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

-4a=-20

a=-20/-4

a=+5

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