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20x+138=27x-3
We move all terms to the left:
20x+138-(27x-3)=0
We get rid of parentheses
20x-27x+3+138=0
We add all the numbers together, and all the variables
-7x+141=0
We move all terms containing x to the left, all other terms to the right
-7x=-141
x=-141/-7
x=20+1/7
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