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x-4=3+8x
We move all terms to the left:
x-4-(3+8x)=0
We add all the numbers together, and all the variables
x-(8x+3)-4=0
We get rid of parentheses
x-8x-3-4=0
We add all the numbers together, and all the variables
-7x-7=0
We move all terms containing x to the left, all other terms to the right
-7x=7
x=7/-7
x=-1
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