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(6*x+15)/4 = 5/4-15*x-25 // - 5/4-15*x-25
(6*x+15)/4-(-15*x)-(5/4)+25 = 0
(6*x+15)/4+15*x-5/4+25 = 0
(6*x+15)/4+(4*15*x)/4-5/4+(4*25)/4 = 0
6*x+4*15*x+4*25-5+15 = 0
66*x-5+15+100 = 0
66*x+10+100 = 0
66*x+110 = 0
(66*x+110)/4 = 0
(66*x+110)/4 = 0 // * 4
66*x+110 = 0
66*x+110 = 0 // - 110
66*x = -110 // : 66
x = -110/66
x = -5/3
x = -5/3
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