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