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x in (-oo:+oo)
x/2-(x/8) = 7 // - 7
x/2-(x/8)-7 = 0
3/8*x-7 = 0 // + 7
3/8*x = 7 // : 3/8
x = 7/3/8
x = 56/3
x = 56/3
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