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a in (-oo:+oo)
6*a = (2*a-4)/7 // - (2*a-4)/7
6*a-((2*a-4)/7) = 0
(-1*(2*a-4))/7+6*a = 0
(-1*(2*a-4))/7+(6*7*a)/7 = 0
6*7*a-1*(2*a-4) = 0
40*a+4 = 0
(40*a+4)/7 = 0
(40*a+4)/7 = 0 // * 7
40*a+4 = 0
40*a+4 = 0 // - 4
40*a = -4 // : 40
a = -4/40
a = -1/10
a = -1/10
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