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x in (-oo:+oo)
3-(-x/8) = 12 // - 12
3-(-x/8)-12 = 0
(1/8)*x-12+3 = 0
1/8*x-9 = 0 // + 9
1/8*x = 9 // : 1/8
x = 9/1/8
x = 72
x = 72
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