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x in (-oo:+oo)
(-3/5)*x+(1/6)*x-(5/8) = 89/24 // - 89/24
(-3/5)*x+(1/6)*x-(5/8)-(89/24) = 0
(-3/5)*x+(1/6)*x-5/8-89/24 = 0
-13/30*x-13/3 = 0 // + 13/3
-13/30*x = 13/3 // : -13/30
x = 13/3/(-13/30)
x = -10
x = -10
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