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x in (-oo:+oo)
10*(-2/5)*(x-5) = 9 // - 9
10*(-2/5)*(x-5)-9 = 0
-4*(x-5)-9 = 0
-4*(x-5)-9 = 0
11-4*x = 0
11-4*x = 0
11-4*x = 0 // - 11
-4*x = -11 // : -4
x = -11/(-4)
x = 11/4
x = 11/4
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