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x in (-oo:+oo)
(1/2)*x+(5/6)*x-5 = -13 // + 13
(1/2)*x+(5/6)*x-5+13 = 0
4/3*x+8 = 0 // - 8
4/3*x = -8 // : 4/3
x = -8/4/3
x = -6
x = -6
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