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x in (-oo:+oo)
r*((3*x^1)/2) = 12 // - 12
r*((3*x^1)/2)-12 = 0
r*((3*x)/2)-12 = 0
3/2*r*x-12 = 0 // + 12
3/2*r*x = 12 // : 3/2*r
x = 12/(3/2*r)
x = 8*r^-1
x = 8*r^-1
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