Solve for n
n=9
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400n-1600+700=300n
Use the distributive property to multiply 400 by n-4.
400n-900=300n
Add -1600 and 700 to get -900.
400n-900-300n=0
Subtract 300n from both sides.
100n-900=0
Combine 400n and -300n to get 100n.
100n=900
Add 900 to both sides. Anything plus zero gives itself.
n=\frac{900}{100}
Divide both sides by 100.
n=9
Divide 900 by 100 to get 9.
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