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66-x=2x+3
We move all terms to the left:
66-x-(2x+3)=0
We add all the numbers together, and all the variables
-1x-(2x+3)+66=0
We get rid of parentheses
-1x-2x-3+66=0
We add all the numbers together, and all the variables
-3x+63=0
We move all terms containing x to the left, all other terms to the right
-3x=-63
x=-63/-3
x=+21
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