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x in (-oo:+oo)
x+(3/5)*x+1/2 = 21/10 // - 21/10
x+(3/5)*x+1/2-(21/10) = 0
x+(3/5)*x+1/2-21/10 = 0
8/5*x-8/5 = 0 // + 8/5
8/5*x = 8/5 // : 8/5
x = 8/5/8/5
x = 1
x = 1
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