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20/210=x
We move all terms to the left:
20/210-(x)=0
We add all the numbers together, and all the variables
-1x+20/210=0
We multiply all the terms by the denominator
-1x*210+20=0
Wy multiply elements
-210x+20=0
We move all terms containing x to the left, all other terms to the right
-210x=-20
x=-20/-210
x=2/21
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