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x in (-oo:+oo)
f = (1/2)*g-(7*h) // - (1/2)*g-(7*h)
f-((1/2)*g)+7*h = 0
f+(-1/2)*g+7*h = 0
f-1/2*g+7*h = 0
x naleu017Cy do R
x in (-oo:+oo)
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