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x in (-oo:+oo)
(4/7)*(x+1) = (1/14)*(x+3) // - (1/14)*(x+3)
(4/7)*(x+1)-((1/14)*(x+3)) = 0
(4/7)*(x+1)+(-1/14)*(x+3) = 0
4/7*(x+1)-1/14*(x+3) = 0
4/7*(x+1)-1/14*(x+3) = 0
1/2*x+5/14 = 0
1/2*x+5/14 = 0
1/2*x+5/14 = 0 // - 5/14
1/2*x = -5/14 // : 1/2
x = -5/14/1/2
x = -5/7
x = -5/7
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