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x in (-oo:+oo)
X/2-2 = 4*x+10 // - 4*x+10
X/2-(4*x)-10-2 = 0
X/2-4*x-10-2 = 0
1/2*X-4*x-12 = 0 // - 1/2*X-12
-4*x = -(1/2*X-12) // : -4
x = (-(1/2*X-12))/(-4)
x = (12-(1/2*X))/(-4)
x = (12-(1/2*X))/(-4)
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