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x in (-oo:+oo)
(5/4)*x+3 = 7/2 // - 7/2
(5/4)*x-(7/2)+3 = 0
(5/4)*x-7/2+3 = 0
5/4*x-1/2 = 0 // + 1/2
5/4*x = 1/2 // : 5/4
x = 1/2/5/4
x = 2/5
x = 2/5
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