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h in (-oo:+oo)
(-3/5)*(10*h+25) = 9 // - 9
(-3/5)*(10*h+25)-9 = 0
-3/5*(10*h+25)-9 = 0
-3/5*(10*h+25)-9 = 0
-6*h-24 = 0
-6*h-24 = 0
-6*h-24 = 0 // + 24
-6*h = 24 // : -6
h = 24/(-6)
h = -4
h = -4
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