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x in (-oo:+oo)
(3/4)*(4*x-8) = -18 // + 18
(3/4)*(4*x-8)+18 = 0
3/4*(4*x-8)+18 = 0
3/4*(4*x-8)+18 = 0
3*x+12 = 0
3*x+12 = 0
3*x+12 = 0 // - 12
3*x = -12 // : 3
x = -12/3
x = -4
x = -4
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