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x in (-oo:+oo)
(2*t)/5-((7/5)*a) = 12/5 // - 12/5
(2*t)/5-((7/5)*a)-(12/5) = 0
(-7/5)*a+(2*t)/5-12/5 = 0
2/5*t-7/5*a-12/5 = 0
x należy do R
x in (-oo:+oo)
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