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x in (-oo:+oo)
x/2 = 50/10 // - 50/10
x/2-(50/10) = 0
x/2-5 = 0
1/2*x-5 = 0 // + 5
1/2*x = 5 // : 1/2
x = 5/1/2
x = 10
x = 10
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