18=3a-7a

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Solution for 18=3a-7a equation: 



18=3a-7a

We move all terms to the left:

18-(3a-7a)=0

We add all the numbers together, and all the variables

-(-4a)+18=0

We get rid of parentheses

4a+18=0

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

4a=-18

a=-18/4

a=-4+1/2

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