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