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a in (-oo:+oo)
(2*a+14)/2 = (2*a+18)/3 // - (2*a+18)/3
(2*a+14)/2-((2*a+18)/3) = 0
(2*a+14)/2+(-1*(2*a+18))/3 = 0
(3*(2*a+14))/(2*3)+(-1*2*(2*a+18))/(2*3) = 0
3*(2*a+14)-1*2*(2*a+18) = 0
2*a+6 = 0
(2*a+6)/(2*3) = 0
(2*a+6)/(2*3) = 0 // * 2*3
2*a+6 = 0
2*a+6 = 0 // - 6
2*a = -6 // : 2
a = -6/2
a = -3
a = -3
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