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x in (-oo:+oo)
2*c-((1/9)*c)+(3/10)*d-((7/10)*d) = 0
2*c+(-1/9)*c+(3/10)*d+(-7/10)*d = 0
17/9*c-2/5*d = 0
x naleu017Cy do R
x in (-oo:+oo)
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