Solve for u
u=80
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5\times 9u-80=4\times 11u
Multiply both sides of the equation by 40, the least common multiple of 8,10.
45u-80=4\times 11u
Multiply 5 and 9 to get 45.
45u-80=44u
Multiply 4 and 11 to get 44.
45u-80-44u=0
Subtract 44u from both sides.
u-80=0
Combine 45u and -44u to get u.
u=80
Add 80 to both sides. Anything plus zero gives itself.
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