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x in (-oo:+oo)
0.68 = (x-50)/0.2 // - (x-50)/0.2
0.68-((x-50)/0.2) = 0
0.68-5*(x-50) = 0
0.68-5*(x-50) = 0
250.68-5*x = 0
250.68-5*x = 0
250.68-5*x = 0 // - 250.68
-5*x = -250.68 // : -5
x = -250.68/(-5)
x = 50.136
x = 50.136
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