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x in (-oo:+oo)
X/2+9 = x/4+3 // - x/4+3
X/2-(x/4)-3+9 = 0
1/2*X-1/4*x+6 = 0 // - 1/2*X+6
-1/4*x = -(1/2*X+6) // : -1/4
x = (-(1/2*X+6))/(-1/4)
x = 4*(1/2*X+6)
x = 4*(1/2*X+6)
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