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(6*8-7)+(5*8+1)=x
We move all terms to the left:
(6*8-7)+(5*8+1)-(x)=0
We add all the numbers together, and all the variables
-x+41+41=0
We add all the numbers together, and all the variables
-1x+82=0
We move all terms containing x to the left, all other terms to the right
-x=-82
x=-82/-1
x=+82
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