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18+2x=3.x-1
We move all terms to the left:
18+2x-(3.x-1)=0
We get rid of parentheses
2x-3.x+1+18=0
We add all the numbers together, and all the variables
-1x+19=0
We move all terms containing x to the left, all other terms to the right
-x=-19
x=-19/-1
x=+19
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