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21(1/3)=x
We move all terms to the left:
21(1/3)-(x)=0
We add all the numbers together, and all the variables
-x+21(+1/3)=0
We add all the numbers together, and all the variables
-1x+21(+1/3)=0
We multiply parentheses
-1x+1/3*21=0
We multiply all the terms by the denominator
-1x*3*21+1=0
Wy multiply elements
-63x*2+1=0
Wy multiply elements
-126x+1=0
We move all terms containing x to the left, all other terms to the right
-126x=-1
x=-1/-126
x=1/126
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