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x in (-oo:+oo)
X-((9/2)*x)-10 = 0
X+(-9/2)*x-10 = 0
X-9/2*x-10 = 0 // - X-10
-9/2*x = -(X-10) // : -9/2
x = (-(X-10))/(-9/2)
x = -2/9*(10-X)
x = -2/9*(10-X)
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