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