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105-x=2x+84
We move all terms to the left:
105-x-(2x+84)=0
We add all the numbers together, and all the variables
-1x-(2x+84)+105=0
We get rid of parentheses
-1x-2x-84+105=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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