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5a-(6-a)=4a-18
We move all terms to the left:
5a-(6-a)-(4a-18)=0
We add all the numbers together, and all the variables
5a-(-1a+6)-(4a-18)=0
We get rid of parentheses
5a+1a-4a-6+18=0
We add all the numbers together, and all the variables
2a+12=0
We move all terms containing a to the left, all other terms to the right
2a=-12
a=-12/2
a=-6
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