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x in (-oo:+oo)
X/3+x/4 = 8/3 // - 8/3
X/3+x/4-(8/3) = 0
X/3+x/4-8/3 = 0
1/3*X+1/4*x-8/3 = 0 // - 1/3*X-8/3
1/4*x = -(1/3*X-8/3) // : 1/4
x = (-(1/3*X-8/3))/1/4
x = 4*(8/3-(1/3*X))
x = 4*(8/3-(1/3*X))
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