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x in (-oo:+oo)
(3/4)*x+4 = 5/8 // - 5/8
(3/4)*x-(5/8)+4 = 0
(3/4)*x-5/8+4 = 0
3/4*x+27/8 = 0 // - 27/8
3/4*x = -27/8 // : 3/4
x = -27/8/3/4
x = -9/2
x = -9/2
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