43=15-7a

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Solution for 43=15-7a equation: 



43=15-7a

We move all terms to the left:

43-(15-7a)=0

We add all the numbers together, and all the variables

-(-7a+15)+43=0

We get rid of parentheses

7a-15+43=0

We add all the numbers together, and all the variables

7a+28=0

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

7a=-28

a=-28/7

a=-4

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