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x in (-oo:+oo)
4 = 7*x+4*x+1/6-(5/2) // - 7*x+4*x+1/6-(5/2)
5/2-(7*x)-(4*x)-(1/6)+4 = 0
5/2-7*x-4*x-1/6+4 = 0
19/3-11*x = 0 // - 19/3
-11*x = -19/3 // : -11
x = -19/3/(-11)
x = 19/33
x = 19/33
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