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x in (-oo:+oo)
X/7+x/6 = 9/7 // - 9/7
X/7+x/6-(9/7) = 0
X/7+x/6-9/7 = 0
1/7*X+1/6*x-9/7 = 0 // - 1/7*X-9/7
1/6*x = -(1/7*X-9/7) // : 1/6
x = (-(1/7*X-9/7))/1/6
x = 6*(9/7-(1/7*X))
x = 6*(9/7-(1/7*X))
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