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x in (-oo:+oo)
X+(4*x)/3 = 28 // - 28
X+(4*x)/3-28 = 0
X+4/3*x-28 = 0 // - X-28
4/3*x = -(X-28) // : 4/3
x = (-(X-28))/4/3
x = 3/4*(28-X)
x = 3/4*(28-X)
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