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x in (-oo:+oo)
(9/8)*(x+3) = 7/8-x // - 7/8-x
(9/8)*(x+3)+x-(7/8) = 0
(9/8)*(x+3)+x-7/8 = 0
9/8*(x+3)+x-7/8 = 0
(9/8*8*(x+3))/8+(8*x)/8-7/8 = 0
9/8*8*(x+3)+8*x-7 = 0
17*x-7+27 = 0
17*x+20 = 0
(17*x+20)/8 = 0
(17*x+20)/8 = 0 // * 8
17*x+20 = 0
17*x+20 = 0 // - 20
17*x = -20 // : 17
x = -20/17
x = -20/17
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