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x in (-oo:+oo)
2/3 = (5/7)*x // - (5/7)*x
2/3-((5/7)*x) = 0
(-5/7)*x+2/3 = 0
2/3-5/7*x = 0 // - 2/3
-5/7*x = -2/3 // : -5/7
x = -2/3/(-5/7)
x = 14/15
x = 14/15
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