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115=4x+3
We move all terms to the left:
115-(4x+3)=0
We get rid of parentheses
-4x-3+115=0
We add all the numbers together, and all the variables
-4x+112=0
We move all terms containing x to the left, all other terms to the right
-4x=-112
x=-112/-4
x=+28
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