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-3a+7a=-14+2a
We move all terms to the left:
-3a+7a-(-14+2a)=0
We add all the numbers together, and all the variables
-3a+7a-(2a-14)=0
We add all the numbers together, and all the variables
4a-(2a-14)=0
We get rid of parentheses
4a-2a+14=0
We add all the numbers together, and all the variables
2a+14=0
We move all terms containing a to the left, all other terms to the right
2a=-14
a=-14/2
a=-7
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