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7+18x=20x-5
We move all terms to the left:
7+18x-(20x-5)=0
We get rid of parentheses
18x-20x+5+7=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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