5a+7a=-13

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Solution for 5a+7a=-13 equation: 



5a+7a=-13

We move all terms to the left:

5a+7a-(-13)=0

We add all the numbers together, and all the variables

12a+13=0

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

12a=-13

a=-13/12

a=-1+1/12

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