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x in (-oo:+oo)
-1/7 = (15/2)*x+4/7 // - (15/2)*x+4/7
-((15/2)*x)-1/7-(4/7) = 0
(-15/2)*x-1/7-4/7 = 0
-15/2*x-5/7 = 0 // + 5/7
-15/2*x = 5/7 // : -15/2
x = 5/7/(-15/2)
x = -2/21
x = -2/21
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