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-14-15x=-14x+21
We move all terms to the left:
-14-15x-(-14x+21)=0
We get rid of parentheses
-15x+14x-21-14=0
We add all the numbers together, and all the variables
-1x-35=0
We move all terms containing x to the left, all other terms to the right
-x=35
x=35/-1
x=-35
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