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x in (-oo:+oo)
x/20 = 65/100 // - 65/100
x/20-(65/100) = 0
x/20-13/20 = 0
1/20*x-13/20 = 0 // + 13/20
1/20*x = 13/20 // : 1/20
x = 13/20/1/20
x = 13
x = 13
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