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R/10-(2/15) = (3*r)/20-(1/5) // - (3*r)/20-(1/5)
R/10-((3*r)/20)-(2/15)+1/5 = 0
R/10+(-3/20)*r-2/15+1/5 = 0
1/10*R-3/20*r+1/15 = 0
x należy do R
x in (-oo:+oo)
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