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x in (-oo:+oo)
x/8 = 4.5 // - 4.5
x/8-4.5 = 0
1/8*x-4.5 = 0 // + 4.5
1/8*x = 4.5 // : 1/8
x = 4.5/1/8
x = 36
x = 36
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