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54=-7+x
We move all terms to the left:
54-(-7+x)=0
We add all the numbers together, and all the variables
-(x-7)+54=0
We get rid of parentheses
-x+7+54=0
We add all the numbers together, and all the variables
-1x+61=0
We move all terms containing x to the left, all other terms to the right
-x=-61
x=-61/-1
x=+61
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