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a in (-oo:+oo)
(1/2)*a+(3/5)*a+1/3 = -94/15 // + -94/15
(1/2)*a+(3/5)*a+1/3-(-94/15) = 0
(1/2)*a+(3/5)*a+1/3+94/15 = 0
11/10*a+33/5 = 0 // - 33/5
11/10*a = -33/5 // : 11/10
a = -33/5/11/10
a = -6
a = -6
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