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359=6x+257
We move all terms to the left:
359-(6x+257)=0
We get rid of parentheses
-6x-257+359=0
We add all the numbers together, and all the variables
-6x+102=0
We move all terms containing x to the left, all other terms to the right
-6x=-102
x=-102/-6
x=+17
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