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1=-3x+14x-21
We move all terms to the left:
1-(-3x+14x-21)=0
We add all the numbers together, and all the variables
-(11x-21)+1=0
We get rid of parentheses
-11x+21+1=0
We add all the numbers together, and all the variables
-11x+22=0
We move all terms containing x to the left, all other terms to the right
-11x=-22
x=-22/-11
x=+2
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