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x in (-oo:+oo)
(5/12)*x = (2/3)*x-(1/7) // - (2/3)*x-(1/7)
(5/12)*x-((2/3)*x)+1/7 = 0
(5/12)*x+(-2/3)*x+1/7 = 0
1/7-1/4*x = 0 // - 1/7
-1/4*x = -1/7 // : -1/4
x = -1/7/(-1/4)
x = 4/7
x = 4/7
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