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5x+138=2x+20
We move all terms to the left:
5x+138-(2x+20)=0
We get rid of parentheses
5x-2x-20+138=0
We add all the numbers together, and all the variables
3x+118=0
We move all terms containing x to the left, all other terms to the right
3x=-118
x=-118/3
x=-39+1/3
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