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y in (-oo:+oo)
3-((13*y)/4) = 3-3*y-(y/4) // - 3-3*y-(y/4)
y/4-((13*y)/4)-(-3*y)-3+3 = 0
(-13/4)*y+3*y+y/4-3+3 = 0
0 = 0
y naleu017Cy do R
y in (-oo:+oo)
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