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x in (-oo:+oo)
(5*x)/(2*5) = 10 // - 10
(5*x)/(2*5)-10 = 0
1/2*x-10 = 0 // + 10
1/2*x = 10 // : 1/2
x = 10/1/2
x = 20
x = 20
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