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x in (-oo:+oo)
2/5 = x/17 // - x/17
2/5-(x/17) = 0
2/5-1/17*x = 0 // - 2/5
-1/17*x = -2/5 // : -1/17
x = -2/5/(-1/17)
x = 34/5
x = 34/5
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