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12-x*2=8
We move all terms to the left:
12-x*2-(8)=0
We add all the numbers together, and all the variables
-x*2+4=0
Wy multiply elements
-2x+4=0
We move all terms containing x to the left, all other terms to the right
-2x=-4
x=-4/-2
x=+2
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