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3\times 3n-120=4\times 5n
Multiply both sides of the equation by 12, the least common multiple of 4,3.
9n-120=4\times 5n
Multiply 3 and 3 to get 9.
9n-120=20n
Multiply 4 and 5 to get 20.
9n-120-20n=0
Subtract 20n from both sides.
-11n-120=0
Combine 9n and -20n to get -11n.
-11n=120
Add 120 to both sides. Anything plus zero gives itself.
n=\frac{120}{-11}
Divide both sides by -11.
n=-\frac{120}{11}
Fraction \frac{120}{-11} can be rewritten as -\frac{120}{11} by extracting the negative sign.