Solve for x
x = \frac{1989}{22} = 90\frac{9}{22} \approx 90.409090909
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9x+13x=1989
Multiply both sides of the equation by 117, the least common multiple of 13,9.
22x=1989
Combine 9x and 13x to get 22x.
x=\frac{1989}{22}
Divide both sides by 22.
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