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x in (-oo:+oo)
(-5/2)*(x-1) = 15 // - 15
(-5/2)*(x-1)-15 = 0
-5/2*(x-1)-15 = 0
-5/2*(x-1)-15 = 0
-5/2*x-25/2 = 0
-5/2*x-25/2 = 0
-5/2*x-25/2 = 0 // + 25/2
-5/2*x = 25/2 // : -5/2
x = 25/2/(-5/2)
x = -5
x = -5
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