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X in (-oo:+oo)
0.3 = (X-4)/4 // - (X-4)/4
0.3-((X-4)/4) = 0
(-1*(X-4))/4+0.3 = 0
(-1*(X-4))/4+(0.3*4)/4 = 0
0.3*4-1*(X-4) = 0
5.2-X = 0
(5.2-X)/4 = 0
(5.2-X)/4 = 0 // * 4
5.2-X = 0
5.2-X = 0 // - 5.2
-X = -5.2 // * -1
X = 5.2
X = 5.2
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