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OpenStudy (anonymous):
Solve for x in the proportion **question attached**
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OpenStudy (anonymous):
OpenStudy (anonymous):
Cross multiply. x(x-1) = 1(x+12) Distribute. x^2 - x = x + 12 Move everything to one side. x^2 - 2x - 12 = 0 Then use the quadratic formula to solve. You should get x = 1 - root 13 and 1 + root 13
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