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x in (-oo:+oo)
(-1/5)*(10*x-15) = 9 // - 9
(-1/5)*(10*x-15)-9 = 0
-1/5*(10*x-15)-9 = 0
-1/5*(10*x-15)-9 = 0
-2*x-6 = 0
-2*x-6 = 0
-2*x-6 = 0 // + 6
-2*x = 6 // : -2
x = 6/(-2)
x = -3
x = -3
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