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x in (-oo:+oo)
1/3 = (2/7)*x-(1/2) // - (2/7)*x-(1/2)
1/3-((2/7)*x)+1/2 = 0
(-2/7)*x+1/3+1/2 = 0
5/6-2/7*x = 0 // - 5/6
-2/7*x = -5/6 // : -2/7
x = -5/6/(-2/7)
x = 35/12
x = 35/12
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