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13.1-2(x+2)=x
We move all terms to the left:
13.1-2(x+2)-(x)=0
We add all the numbers together, and all the variables
-1x-2(x+2)+13.1=0
We multiply parentheses
-1x-2x-4+13.1=0
We add all the numbers together, and all the variables
-3x+9.1=0
We move all terms containing x to the left, all other terms to the right
-3x=-9.1
x=-9.1/-3
x=3+0.1/3
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