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a in (-oo:+oo)
(2*a+3)/7 = (3*a)/6 // - (3*a)/6
(2*a+3)/7-((3*a)/6) = 0
(2*a+3)/7+(-1/2)*a = 0
(2*a+3)/7-a/2 = 0
(2*(2*a+3))/(2*7)+(7*(-a))/(2*7) = 0
2*(2*a+3)+7*(-a) = 0
6-3*a = 0
(6-3*a)/(2*7) = 0
(6-3*a)/(2*7) = 0 // * 2*7
6-3*a = 0
6-3*a = 0 // - 6
-3*a = -6 // : -3
a = -6/(-3)
a = 2
a = 2
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