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7x-12x-1=18-7
We move all terms to the left:
7x-12x-1-(18-7)=0
We add all the numbers together, and all the variables
7x-12x-1-11=0
We add all the numbers together, and all the variables
-5x-12=0
We move all terms containing x to the left, all other terms to the right
-5x=12
x=12/-5
x=-2+2/5
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