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x in (-oo:+oo)
x/8 = 4.2 // - 4.2
x/8-4.2 = 0
1/8*x-4.2 = 0 // + 4.2
1/8*x = 4.2 // : 1/8
x = 4.2/1/8
x = 33.6
x = 33.6
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