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