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x in (-oo:+oo)
x/21 = -(6/7) // + 6/7
x/21+6/7 = 0
1/21*x+6/7 = 0 // - 6/7
1/21*x = -6/7 // : 1/21
x = -6/7/1/21
x = -18
x = -18
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