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x in (-oo:+oo)
61/9 = 4*x+6*x-1 // - 4*x+6*x-1
61/9-(4*x)-(6*x)+1 = 0
61/9-4*x-6*x+1 = 0
70/9-10*x = 0 // - 70/9
-10*x = -70/9 // : -10
x = -70/9/(-10)
x = 7/9
x = 7/9
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