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x in (-oo:+oo)
(-2/7)*x = 1/5 // - 1/5
(-2/7)*x-(1/5) = 0
(-2/7)*x-1/5 = 0
-2/7*x-1/5 = 0 // + 1/5
-2/7*x = 1/5 // : -2/7
x = 1/5/(-2/7)
x = -7/10
x = -7/10
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