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x in (-oo:+oo)
x/2+3 = 1-2*x // - 1-2*x
x/2-(-2*x)-1+3 = 0
x/2+2*x-1+3 = 0
5/2*x+2 = 0 // - 2
5/2*x = -2 // : 5/2
x = -2/5/2
x = -4/5
x = -4/5
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