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x in (-oo:+oo)
4/5-(x/10) = 2 // - 2
4/5-(x/10)-2 = 0
-1/10*x-6/5 = 0 // + 6/5
-1/10*x = 6/5 // : -1/10
x = 6/5/(-1/10)
x = -12
x = -12
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