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16\times 5x+54=8\times 7x+9
Multiply both sides of the equation by 48, the least common multiple of 3,8,6,16.
80x+54=8\times 7x+9
Multiply 16 and 5 to get 80.
80x+54=56x+9
Multiply 8 and 7 to get 56.
80x+54-56x=9
Subtract 56x from both sides.
24x+54=9
Combine 80x and -56x to get 24x.
24x=9-54
Subtract 54 from both sides.
24x=-45
Subtract 54 from 9 to get -45.
x=\frac{-45}{24}
Divide both sides by 24.
x=-\frac{15}{8}
Reduce the fraction \frac{-45}{24} to lowest terms by extracting and canceling out 3.