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a in (-oo:+oo)
(-10/3)*a+(5/3)*a = 35/6 // - 35/6
(-10/3)*a+(5/3)*a-(35/6) = 0
(-10/3)*a+(5/3)*a-35/6 = 0
-5/3*a-35/6 = 0 // + 35/6
-5/3*a = 35/6 // : -5/3
a = 35/6/(-5/3)
a = -7/2
a = -7/2
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