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OpenStudy (anonymous):
Solve for x in the proportion 3x over 3x - 36 = -1 over x
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OpenStudy (kropot72):
Cross multiply to get: 3x^2 = -3x + 36 3x^2 + 3x -36 = 0 Now solve the quadratic
OpenStudy (kropot72):
Simplify the quadratic by dividing both sides by 3 \[x ^{2}+x-12=0\] Can you factorise this?
OpenStudy (precal):
(x+4)(x-3)=0 finish solving it
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