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x in (-oo:+oo)
(7/8)*(x+3) = 11/8 // - 11/8
(7/8)*(x+3)-(11/8) = 0
(7/8)*(x+3)-11/8 = 0
7/8*(x+3)-11/8 = 0
(7/8*8*(x+3))/8-11/8 = 0
7/8*8*(x+3)-11 = 0
7*x+10 = 0
(7*x+10)/8 = 0
(7*x+10)/8 = 0 // * 8
7*x+10 = 0
7*x+10 = 0 // - 10
7*x = -10 // : 7
x = -10/7
x = -10/7
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