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a in (-oo:+oo)
(-2/7)*a-a-(1/3) = -116/105 // + -116/105
(-2/7)*a-a-(1/3)-(-116/105) = 0
(-2/7)*a-a-1/3+116/105 = 0
27/35-9/7*a = 0 // - 27/35
-9/7*a = -27/35 // : -9/7
a = -27/35/(-9/7)
a = 3/5
a = 3/5
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