7+2a=-13

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Solution for 7+2a=-13 equation: 



7+2a=-13

We move all terms to the left:

7+2a-(-13)=0

We add all the numbers together, and all the variables

2a+20=0

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

2a=-20

a=-20/2

a=-10

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