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a in (-oo:+oo)
75*a+12/7 = 15*(5*a-(1/2)) // - 15*(5*a-(1/2))
75*a-(15*(5*a-(1/2)))+12/7 = 0
75*a-15*(5*a-1/2)+12/7 = 0
(-15*7*(5*a-1/2))/7+(7*75*a)/7+12/7 = 0
7*75*a-15*7*(5*a-1/2)+12 = 0
12+105/2 = 0
129/2 = 0
129/2/7 = 0
129/2/7 = 0 // * 7
129/2 = 0
a belongs to the empty set
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