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1/3(7-7x)=21
We move all terms to the left:
1/3(7-7x)-(21)=0
Domain of the equation: 3(7-7x)!=0We add all the numbers together, and all the variables
x∈R
1/3(-7x+7)-21=0
We multiply all the terms by the denominator
-21*3(-7x+7)+1=0
Wy multiply elements
-63x(-+1=0
We use the square of the difference formula
-63x(-1=0
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