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x in (-oo:+oo)
(-3/8)*x+(5/56)*x = 16 // - 16
(-3/8)*x+(5/56)*x-16 = 0
-2/7*x-16 = 0 // + 16
-2/7*x = 16 // : -2/7
x = 16/(-2/7)
x = -56
x = -56
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