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x in (-oo:+oo)
((3*x)/2)*x-3 = m+7 // - m+7
((3*x)/2)*x-m-7-3 = 0
3/2*x^2 = -(-m-10) // : 3/2
x^2 = 2/3*(m+10)
x^2 = 2/3*(m+10) // ^ 1/2
abs(x) = (2/3)^(1/2)*(m+10)^(1/2)
x = (2/3)^(1/2)*(m+10)^(1/2) or x = -((2/3)^(1/2)*(m+10)^(1/2))
x in { (2/3)^(1/2)*(m+10)^(1/2), -((2/3)^(1/2)*(m+10)^(1/2)) }
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