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x in (-oo:+oo)
x/2 = 10.5 // - 10.5
x/2-10.5 = 0
1/2*x-10.5 = 0 // + 10.5
1/2*x = 10.5 // : 1/2
x = 10.5/1/2
x = 21
x = 21
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