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8x-2x+58=8x+40
We move all terms to the left:
8x-2x+58-(8x+40)=0
We add all the numbers together, and all the variables
6x-(8x+40)+58=0
We get rid of parentheses
6x-8x-40+58=0
We add all the numbers together, and all the variables
-2x+18=0
We move all terms containing x to the left, all other terms to the right
-2x=-18
x=-18/-2
x=+9
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