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65-x=77-2x
We move all terms to the left:
65-x-(77-2x)=0
We add all the numbers together, and all the variables
-x-(-2x+77)+65=0
We add all the numbers together, and all the variables
-1x-(-2x+77)+65=0
We get rid of parentheses
-1x+2x-77+65=0
We add all the numbers together, and all the variables
x-12=0
We move all terms containing x to the left, all other terms to the right
x=12
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