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x in (-oo:+oo)
x/8+7/2 = -3 // + 3
x/8+7/2+3 = 0
1/8*x+13/2 = 0 // - 13/2
1/8*x = -13/2 // : 1/8
x = -13/2/1/8
x = -52
x = -52
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