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x in (-oo:+oo)
2*x+5/7 = 6*x-(135/7) // - 6*x-(135/7)
2*x-(6*x)+5/7+135/7 = 0
2*x-6*x+5/7+135/7 = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x = 5
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