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3*b = (1/2)*r-(2*m) // - (1/2)*r-(2*m)
3*b+2*m-((1/2)*r) = 0
3*b+2*m+(-1/2)*r = 0
3*b+2*m-1/2*r = 0
x naleu017Cy do R
x in (-oo:+oo)
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