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x in (-oo:+oo)
1/5-x = (3*x)/8-1 // - (3*x)/8-1
1/5-x-((3*x)/8)+1 = 0
(-3/8)*x-x+1/5+1 = 0
6/5-11/8*x = 0 // - 6/5
-11/8*x = -6/5 // : -11/8
x = -6/5/(-11/8)
x = 48/55
x = 48/55
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