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2a-(6+6a)=-2/7
We move all terms to the left:
2a-(6+6a)-(-2/7)=0
We add all the numbers together, and all the variables
2a-(6a+6)-(-2/7)=0
We get rid of parentheses
2a-6a-6+2/7=0
We multiply all the terms by the denominator
2a*7-6a*7+2-6*7=0
We add all the numbers together, and all the variables
2a*7-6a*7-40=0
Wy multiply elements
14a-42a-40=0
We add all the numbers together, and all the variables
-28a-40=0
We move all terms containing a to the left, all other terms to the right
-28a=40
a=40/-28
a=-1+3/7
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