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a in (-oo:+oo)
(1/4)*a+(1/3)*a+1 = -29/6 // + -29/6
(1/4)*a+(1/3)*a-(-29/6)+1 = 0
(1/4)*a+(1/3)*a+29/6+1 = 0
7/12*a+35/6 = 0 // - 35/6
7/12*a = -35/6 // : 7/12
a = -35/6/7/12
a = -10
a = -10
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