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x in (-oo:+oo)
33/r = x/6 // - x/6
33/r-(x/6) = 0
33*r^-1-1/6*x = 0 // - 33*r^-1
-1/6*x = -(33*r^-1) // : -1/6
x = (-(33*r^-1))/(-1/6)
x = 198*r^-1
x = 198*r^-1
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