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x in (-oo:+oo)
-((9/2)*x)-9 = 6.3 // - 6.3
-((9/2)*x)-9-6.3 = 0
(-9/2)*x-9-6.3 = 0
-9/2*x-15.3 = 0 // + 15.3
-9/2*x = 15.3 // : -9/2
x = 15.3/(-9/2)
x = -3.4
x = -3.4
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