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7*x-((9/7)*x^2)+25 = 0
(-9/7)*x^2+7*x+25 = 0
7*x-9/7*x^2+25 = 0
DELTA = 7^2-(-9/7*4*25)
DELTA = 1243/7
DELTA > 0
x = ((1243/7)^(1/2)-7)/(-9/7*2) or x = (-(1243/7)^(1/2)-7)/(-9/7*2)
x = -7/18*((1243/7)^(1/2)-7) or x = 7/18*((1243/7)^(1/2)+7)
x in { -7/18*((1243/7)^(1/2)-7), 7/18*((1243/7)^(1/2)+7) }
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