a+3a-7=4a-7

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Solution for a+3a-7=4a-7 equation: 



a+3a-7=4a-7

We move all terms to the left:

a+3a-7-(4a-7)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4a-4a+7-7=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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