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x in (-oo:+oo)
x/4 = 2*x+1.2 // - 2*x+1.2
x/4-(2*x)-1.2 = 0
x/4-2*x-1.2 = 0
-7/4*x-1.2 = 0 // + 1.2
-7/4*x = 1.2 // : -7/4
x = 1.2/(-7/4)
x = -0.68571429
x = -0.68571429
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