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x in (-oo:+oo)
X = 6*((3*x)/10-2) // - 6*((3*x)/10-2)
X-(6*((3*x)/10-2)) = 0
X-6*((3*x)/10-2) = 0
X-6*(3/10*x-2) = 0
X-6*(3/10*x-2) = 0
X-9/5*x+12 = 0
X-9/5*x+12 = 0
X-9/5*x+12 = 0 // - X+12
-9/5*x = -(X+12) // : -9/5
x = (-(X+12))/(-9/5)
x = 5/9*(X+12)
x = 5/9*(X+12)
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