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7-x=2x+21
We move all terms to the left:
7-x-(2x+21)=0
We add all the numbers together, and all the variables
-1x-(2x+21)+7=0
We get rid of parentheses
-1x-2x-21+7=0
We add all the numbers together, and all the variables
-3x-14=0
We move all terms containing x to the left, all other terms to the right
-3x=14
x=14/-3
x=-4+2/3
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