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x in (-oo:+oo)
(-2/5)*x = -10/14 // + -10/14
(-2/5)*x-(-10/14) = 0
(-2/5)*x+5/7 = 0
5/7-2/5*x = 0 // - 5/7
-2/5*x = -5/7 // : -2/5
x = -5/7/(-2/5)
x = 25/14
x = 25/14
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