Solve for n
n=15
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3\times 20=4n
Multiply both sides of the equation by 84, the least common multiple of 28,21.
60=4n
Multiply 3 and 20 to get 60.
4n=60
Swap sides so that all variable terms are on the left hand side.
n=\frac{60}{4}
Divide both sides by 4.
n=15
Divide 60 by 4 to get 15.
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