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x in (-oo:+oo)
(1/2)*x-(2/3) = 4*x // - 4*x
(1/2)*x-(4*x)-(2/3) = 0
(1/2)*x-4*x-2/3 = 0
-7/2*x-2/3 = 0 // + 2/3
-7/2*x = 2/3 // : -7/2
x = 2/3/(-7/2)
x = -4/21
x = -4/21
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