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x in (-oo:+oo)
(1/3)*x-(1/2) = 4 // - 4
(1/3)*x-(1/2)-4 = 0
(1/3)*x-1/2-4 = 0
1/3*x-9/2 = 0 // + 9/2
1/3*x = 9/2 // : 1/3
x = 9/2/1/3
x = 27/2
x = 27/2
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