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x in (-oo:+oo)
(-5/2)*x = (7/2)*x-(1/7) // - (7/2)*x-(1/7)
(-5/2)*x-((7/2)*x)+1/7 = 0
(-5/2)*x+(-7/2)*x+1/7 = 0
1/7-6*x = 0 // - 1/7
-6*x = -1/7 // : -6
x = -1/7/(-6)
x = 1/42
x = 1/42
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