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21x=-14x-28
We move all terms to the left:
21x-(-14x-28)=0
We get rid of parentheses
21x+14x+28=0
We add all the numbers together, and all the variables
35x+28=0
We move all terms containing x to the left, all other terms to the right
35x=-28
x=-28/35
x=-4/5
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