7a-15=1+3a-4a

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Solution for 7a-15=1+3a-4a equation: 



7a-15=1+3a-4a

We move all terms to the left:

7a-15-(1+3a-4a)=0

We add all the numbers together, and all the variables

7a-(-1a+1)-15=0

We get rid of parentheses

7a+1a-1-15=0

We add all the numbers together, and all the variables

8a-16=0

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

8a=16

a=16/8

a=2

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