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x in (-oo:+oo)
5*x+21/10 = x/5 // - x/5
5*x-(x/5)+21/10 = 0
24/5*x+21/10 = 0 // - 21/10
24/5*x = -21/10 // : 24/5
x = -21/10/24/5
x = -7/16
x = -7/16
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