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x in (-oo:+oo)
(3/16)*(x-4) = (3/8)*(x+1) // - (3/8)*(x+1)
(3/16)*(x-4)-((3/8)*(x+1)) = 0
(3/16)*(x-4)+(-3/8)*(x+1) = 0
3/16*(x-4)-3/8*(x+1) = 0
3/16*(x-4)-3/8*(x+1) = 0
-3/16*x-9/8 = 0
-3/16*x-9/8 = 0
-3/16*x-9/8 = 0 // + 9/8
-3/16*x = 9/8 // : -3/16
x = 9/8/(-3/16)
x = -6
x = -6
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