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x in (-oo:+oo)
(-1/5)*(x-100) = 12 // - 12
(-1/5)*(x-100)-12 = 0
-1/5*(x-100)-12 = 0
-1/5*(x-100)-12 = 0
8-1/5*x = 0
8-1/5*x = 0
8-1/5*x = 0 // - 8
-1/5*x = -8 // : -1/5
x = -8/(-1/5)
x = 40
x = 40
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