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a in (-oo:+oo)
(3/5)*a+6 = (1/3)*a+88/15 // - (1/3)*a+88/15
(3/5)*a-((1/3)*a)-(88/15)+6 = 0
(3/5)*a+(-1/3)*a-88/15+6 = 0
4/15*a+2/15 = 0 // - 2/15
4/15*a = -2/15 // : 4/15
a = -2/15/4/15
a = -1/2
a = -1/2
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