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