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