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