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x in (-oo:+oo)
X = 7-((2*x)/3) // - 7-((2*x)/3)
X+(2*x)/3-7 = 0
X+2/3*x-7 = 0 // - X-7
2/3*x = -(X-7) // : 2/3
x = (-(X-7))/2/3
x = 3/2*(7-X)
x = 3/2*(7-X)
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