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x in (-oo:+oo)
(3/8)*(x+4/7) = 1/7 // - 1/7
(3/8)*(x+4/7)-(1/7) = 0
(3/8)*(x+4/7)-1/7 = 0
3/8*(x+4/7)-1/7 = 0
(3/8*7*(x+4/7))/7-1/7 = 0
3/8*7*(x+4/7)-1 = 0
21/8*x+1/2 = 0
(21/8*x+1/2)/7 = 0
(21/8*x+1/2)/7 = 0 // * 7
21/8*x+1/2 = 0
21/8*x+1/2 = 0 // - 1/2
21/8*x = -1/2 // : 21/8
x = -1/2/21/8
x = -4/21
x = -4/21
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