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3x+18=0*
We move all terms to the left:
3x+18-(0*)=0
We add all the numbers together, and all the variables
3x+18-0=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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