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x in (-oo:+oo)
(1/3)*x+2/7-(1/4) = (2/3)*x // - (2/3)*x
(1/3)*x-((2/3)*x)+2/7-(1/4) = 0
(1/3)*x+(-2/3)*x+2/7-1/4 = 0
1/28-1/3*x = 0 // - 1/28
-1/3*x = -1/28 // : -1/3
x = -1/28/(-1/3)
x = 3/28
x = 3/28
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