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x+5x=3x-18
We move all terms to the left:
x+5x-(3x-18)=0
We add all the numbers together, and all the variables
6x-(3x-18)=0
We get rid of parentheses
6x-3x+18=0
We add all the numbers together, and all the variables
3x+18=0
We move all terms containing x to the left, all other terms to the right
3x=-18
x=-18/3
x=-6
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