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x in (-oo:+oo)
x/8 = 10.5 // - 10.5
x/8-10.5 = 0
1/8*x-10.5 = 0 // + 10.5
1/8*x = 10.5 // : 1/8
x = 10.5/1/8
x = 84
x = 84
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