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x in (-oo:+oo)
x/8 = 3.5 // - 3.5
x/8-3.5 = 0
1/8*x-3.5 = 0 // + 3.5
1/8*x = 3.5 // : 1/8
x = 3.5/1/8
x = 28
x = 28
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