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x in (-oo:+oo)
x/4 = (2*x+3)/15 // - (2*x+3)/15
x/4-((2*x+3)/15) = 0
(-1*(2*x+3))/15+x/4 = 0
(-1*4*(2*x+3))/(4*15)+(15*x)/(4*15) = 0
15*x-1*4*(2*x+3) = 0
7*x-12 = 0
(7*x-12)/(4*15) = 0
(7*x-12)/(4*15) = 0 // * 4*15
7*x-12 = 0
7*x-12 = 0 // + 12
7*x = 12 // : 7
x = 12/7
x = 12/7
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