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2x/21=(-20)
We move all terms to the left:
2x/21-((-20))=0
We add all the numbers together, and all the variables
2x/21+20=0
We multiply all the terms by the denominator
2x+20*21=0
We add all the numbers together, and all the variables
2x+420=0
We move all terms containing x to the left, all other terms to the right
2x=-420
x=-420/2
x=-210
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