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x in (-oo:+oo)
(-2/7)*x = -4/35 // + -4/35
(-2/7)*x-(-4/35) = 0
(-2/7)*x+4/35 = 0
4/35-2/7*x = 0 // - 4/35
-2/7*x = -4/35 // : -2/7
x = -4/35/(-2/7)
x = 2/5
x = 2/5
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