Solve for x
x = \frac{38800}{9} = 4311\frac{1}{9} \approx 4311.111111111
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38800=9x
Subtract 1200 from 40000 to get 38800.
9x=38800
Swap sides so that all variable terms are on the left hand side.
x=\frac{38800}{9}
Divide both sides by 9.
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