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x in (-oo:+oo)
(3/4)*x-(1/2) = 4 // - 4
(3/4)*x-(1/2)-4 = 0
(3/4)*x-1/2-4 = 0
3/4*x-9/2 = 0 // + 9/2
3/4*x = 9/2 // : 3/4
x = 9/2/3/4
x = 6
x = 6
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