Solve for x
x = \frac{20}{11} = 1\frac{9}{11} \approx 1.818181818
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11x+1=21
Combine 7x and 4x to get 11x.
11x=21-1
Subtract 1 from both sides.
11x=20
Subtract 1 from 21 to get 20.
x=\frac{20}{11}
Divide both sides by 11.
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