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139-(3x+14)=2x
We move all terms to the left:
139-(3x+14)-(2x)=0
We add all the numbers together, and all the variables
-2x-(3x+14)+139=0
We get rid of parentheses
-2x-3x-14+139=0
We add all the numbers together, and all the variables
-5x+125=0
We move all terms containing x to the left, all other terms to the right
-5x=-125
x=-125/-5
x=+25
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