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x in (-oo:+oo)
31/35 = 3*x+1/2 // - 3*x+1/2
31/35-(3*x)-(1/2) = 0
31/35-3*x-1/2 = 0
27/70-3*x = 0 // - 27/70
-3*x = -27/70 // : -3
x = -27/70/(-3)
x = 9/70
x = 9/70
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