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x in (-oo:+oo)
X/3+x/7 = 9/7 // - 9/7
X/3+x/7-(9/7) = 0
X/3+x/7-9/7 = 0
1/3*X+1/7*x-9/7 = 0 // - 1/3*X-9/7
1/7*x = -(1/3*X-9/7) // : 1/7
x = (-(1/3*X-9/7))/1/7
x = 7*(9/7-(1/3*X))
x = 7*(9/7-(1/3*X))
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