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x in (-oo:+oo)
(-2/7)*x = 8/35 // - 8/35
(-2/7)*x-(8/35) = 0
(-2/7)*x-8/35 = 0
-2/7*x-8/35 = 0 // + 8/35
-2/7*x = 8/35 // : -2/7
x = 8/35/(-2/7)
x = -4/5
x = -4/5
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