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5\left(n-3\right)-2\left(n-4\right)=100
Multiply both sides of the equation by 10, the least common multiple of 2,5.
5n-15-2\left(n-4\right)=100
Use the distributive property to multiply 5 by n-3.
5n-15-2n+8=100
Use the distributive property to multiply -2 by n-4.
3n-15+8=100
Combine 5n and -2n to get 3n.
3n-7=100
Add -15 and 8 to get -7.
3n=100+7
Add 7 to both sides.
3n=107
Add 100 and 7 to get 107.
n=\frac{107}{3}
Divide both sides by 3.