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Y/4 = (3*y)/5-2.1 // - (3*y)/5-2.1
Y/4-((3*y)/5)+2.1 = 0
Y/4+(-3/5)*y+2.1 = 0
1/4*Y-3/5*y+2.1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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