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x in (-oo:+oo)
(-3/5)*x = 6/7 // - 6/7
(-3/5)*x-(6/7) = 0
(-3/5)*x-6/7 = 0
-3/5*x-6/7 = 0 // + 6/7
-3/5*x = 6/7 // : -3/5
x = 6/7/(-3/5)
x = -10/7
x = -10/7
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