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x in (-oo:+oo)
x/2 = 26.5 // - 26.5
x/2-26.5 = 0
1/2*x-26.5 = 0 // + 26.5
1/2*x = 26.5 // : 1/2
x = 26.5/1/2
x = 53
x = 53
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