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x in (-oo:+oo)
(1/4)*x-(3/7) = (2/7)*x-(1/4) // - (2/7)*x-(1/4)
(1/4)*x-((2/7)*x)-(3/7)+1/4 = 0
(1/4)*x+(-2/7)*x-3/7+1/4 = 0
-1/28*x-5/28 = 0 // + 5/28
-1/28*x = 5/28 // : -1/28
x = 5/28/(-1/28)
x = -5
x = -5
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