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84+x*1=8x
We move all terms to the left:
84+x*1-(8x)=0
We add all the numbers together, and all the variables
-8x+x*1+84=0
Wy multiply elements
-8x+x+84=0
We add all the numbers together, and all the variables
-7x+84=0
We move all terms containing x to the left, all other terms to the right
-7x=-84
x=-84/-7
x=+12
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