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x in (-oo:+oo)
4*(3-x) = 4/2 // - 4/2
4*(3-x)-(4/2) = 0
4*(3-x)-2 = 0
4*(3-x)-2 = 0
10-4*x = 0
10-4*x = 0
10-4*x = 0 // - 10
-4*x = -10 // : -4
x = -10/(-4)
x = 5/2
x = 5/2
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