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13-x/8=12.75
We move all terms to the left:
13-x/8-(12.75)=0
We add all the numbers together, and all the variables
-x/8+0.25=0
We multiply all the terms by the denominator
-x+(0.25)*8=0
We add all the numbers together, and all the variables
-1x+2=0
We move all terms containing x to the left, all other terms to the right
-x=-2
x=-2/-1
x=+2
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