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345-4x=265+12x
We move all terms to the left:
345-4x-(265+12x)=0
We add all the numbers together, and all the variables
-4x-(12x+265)+345=0
We get rid of parentheses
-4x-12x-265+345=0
We add all the numbers together, and all the variables
-16x+80=0
We move all terms containing x to the left, all other terms to the right
-16x=-80
x=-80/-16
x=+5
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