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125=2x+3
We move all terms to the left:
125-(2x+3)=0
We get rid of parentheses
-2x-3+125=0
We add all the numbers together, and all the variables
-2x+122=0
We move all terms containing x to the left, all other terms to the right
-2x=-122
x=-122/-2
x=+61
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