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x in (-oo:+oo)
(3/4)*(8*x-4)-x = -28 // + 28
(3/4)*(8*x-4)-x+28 = 0
3/4*(8*x-4)-x+28 = 0
3/4*(8*x-4)-x+28 = 0
5*x-3+28 = 0
5*x+25 = 0
5*x+25 = 0
5*x+25 = 0 // - 25
5*x = -25 // : 5
x = -25/5
x = -5
x = -5
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