Solve for x
x = \frac{40}{13} = 3\frac{1}{13} \approx 3.076923077
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40=13x
Combine 9x and 4x to get 13x.
13x=40
Swap sides so that all variable terms are on the left hand side.
x=\frac{40}{13}
Divide both sides by 13.
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