6a-7-a=18

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Solution for 6a-7-a=18 equation: 



6a-7-a=18

We move all terms to the left:

6a-7-a-(18)=0

We add all the numbers together, and all the variables

5a-25=0

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

5a=25

a=25/5

a=5

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