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x in (-oo:+oo)
4-((2*x)/30) = x-1/6 // - x-1/6
4-((2*x)/30)-x-(-1/6) = 0
(-1/15)*x-x+1/6+4 = 0
25/6-16/15*x = 0 // - 25/6
-16/15*x = -25/6 // : -16/15
x = -25/6/(-16/15)
x = 125/32
x = 125/32
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