1+3a=7a-7

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Solution for 1+3a=7a-7 equation: 



1+3a=7a-7

We move all terms to the left:

1+3a-(7a-7)=0

We get rid of parentheses

3a-7a+7+1=0

We add all the numbers together, and all the variables

-4a+8=0

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

-4a=-8

a=-8/-4

a=+2

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