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21/3x=21
We move all terms to the left:
21/3x-(21)=0
Domain of the equation: 3x!=0We multiply all the terms by the denominator
x!=0/3
x!=0
x∈R
-21*3x+21=0
Wy multiply elements
-63x+21=0
We move all terms containing x to the left, all other terms to the right
-63x=-21
x=-21/-63
x=1/3
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