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x in (-oo:+oo)
5/2-(x/5) = 7/10 // - 7/10
5/2-(x/5)-(7/10) = 0
5/2-(x/5)-7/10 = 0
9/5-1/5*x = 0 // - 9/5
-1/5*x = -9/5 // : -1/5
x = -9/5/(-1/5)
x = 9
x = 9
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