5a-7a=-1

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Solution for 5a-7a=-1 equation: 



5a-7a=-1

We move all terms to the left:

5a-7a-(-1)=0

We add all the numbers together, and all the variables

-2a+1=0

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

-2a=-1

a=-1/-2

a=1/2

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