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8x+4x=x-1
We move all terms to the left:
8x+4x-(x-1)=0
We add all the numbers together, and all the variables
12x-(x-1)=0
We get rid of parentheses
12x-x+1=0
We add all the numbers together, and all the variables
11x+1=0
We move all terms containing x to the left, all other terms to the right
11x=-1
x=-1/11
x=-1/11
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