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