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a in (-oo:+oo)
4*a+5 = (-2/3)*a+169/3 // - (-2/3)*a+169/3
4*a-((-2/3)*a)-(169/3)+5 = 0
4*a+(2/3)*a-169/3+5 = 0
14/3*a-154/3 = 0 // + 154/3
14/3*a = 154/3 // : 14/3
a = 154/3/14/3
a = 11
a = 11
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