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x in (-oo:+oo)
2/7 = (3*x)/5 // - (3*x)/5
2/7-((3*x)/5) = 0
(-3/5)*x+2/7 = 0
2/7-3/5*x = 0 // - 2/7
-3/5*x = -2/7 // : -3/5
x = -2/7/(-3/5)
x = 10/21
x = 10/21
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