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x in (-oo:+oo)
3-(4/5) = x/5+4 // - x/5+4
3-(x/5)-(4/5)-4 = 0
3-(x/5)-4/5-4 = 0
-1/5*x-9/5 = 0 // + 9/5
-1/5*x = 9/5 // : -1/5
x = 9/5/(-1/5)
x = -9
x = -9
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