Solve for N
N=4
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10+5+5=N\times 5
Add 5 and 5 to get 10.
15+5=N\times 5
Add 10 and 5 to get 15.
20=N\times 5
Add 15 and 5 to get 20.
N\times 5=20
Swap sides so that all variable terms are on the left hand side.
N=\frac{20}{5}
Divide both sides by 5.
N=4
Divide 20 by 5 to get 4.
Examples
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Limits
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