a=7.b=-4

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Solution for a=7.b=-4 equation: 



=7.A=-4

We move all terms to the left:

-(7.A)=0

We add all the numbers together, and all the variables

-(+7.A)=0

We get rid of parentheses

-7.A=0

We add all the numbers together, and all the variables

-7A=0

A=0/-7

A=0

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