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6n-9n+10n/21=21
We move all terms to the left:
6n-9n+10n/21-(21)=0
We add all the numbers together, and all the variables
-3n+10n/21-21=0
We multiply all the terms by the denominator
-3n*21+10n-21*21=0
We add all the numbers together, and all the variables
10n-3n*21-441=0
Wy multiply elements
10n-63n-441=0
We add all the numbers together, and all the variables
-53n-441=0
We move all terms containing n to the left, all other terms to the right
-53n=441
n=441/-53
n=-8+17/53
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