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54=a-(-18)
We move all terms to the left:
54-(a-(-18))=0
We calculate terms in parentheses: -(a-(-18)), so:We get rid of parentheses
a-(-18)
We add all the numbers together, and all the variables
a+18
Back to the equation:
-(a+18)
-a-18+54=0
We add all the numbers together, and all the variables
-1a+36=0
We move all terms containing a to the left, all other terms to the right
-a=-36
a=-36/-1
a=+36
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