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x in (-oo:+oo)
(2/5)*a-((3/4)*b) = c // - c
(2/5)*a-((3/4)*b)-c = 0
(2/5)*a+(-3/4)*b-c = 0
2/5*a-3/4*b-c = 0
x naleu017Cy do R
x in (-oo:+oo)
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