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x in (-oo:+oo)
(5/4)*x-(3/4) = 7 // - 7
(5/4)*x-(3/4)-7 = 0
(5/4)*x-3/4-7 = 0
5/4*x-31/4 = 0 // + 31/4
5/4*x = 31/4 // : 5/4
x = 31/4/5/4
x = 31/5
x = 31/5
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