5a-7a=-4

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Solution for 5a-7a=-4 equation: 



5a-7a=-4

We move all terms to the left:

5a-7a-(-4)=0

We add all the numbers together, and all the variables

-2a+4=0

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

-2a=-4

a=-4/-2

a=+2

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