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x in (-oo:+oo)
-1/2 = (1/5)*x-(4/7) // - (1/5)*x-(4/7)
4/7-((1/5)*x)-1/2 = 0
(-1/5)*x-1/2+4/7 = 0
1/14-1/5*x = 0 // - 1/14
-1/5*x = -1/14 // : -1/5
x = -1/14/(-1/5)
x = 5/14
x = 5/14
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