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x in (-oo:+oo)
(1/4)*x+2 = (2/7)*x+47/28 // - (2/7)*x+47/28
(1/4)*x-((2/7)*x)-(47/28)+2 = 0
(1/4)*x+(-2/7)*x-47/28+2 = 0
9/28-1/28*x = 0 // - 9/28
-1/28*x = -9/28 // : -1/28
x = -9/28/(-1/28)
x = 9
x = 9
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