2(a+-4)+15=13

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Solution for 2(a+-4)+15=13 equation: 



2(a+-4)+15=13

We move all terms to the left:

2(a+-4)+15-(13)=0

We add all the numbers together, and all the variables

2(a-4)+15-13=0

We add all the numbers together, and all the variables

2(a-4)+2=0

We multiply parentheses

2a-8+2=0

We add all the numbers together, and all the variables

2a-6=0

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

2a=6

a=6/2

a=3

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