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x in (-oo:+oo)
5*x+3 = 3/4 // - 3/4
5*x-(3/4)+3 = 0
5*x-3/4+3 = 0
5*x+9/4 = 0 // - 9/4
5*x = -9/4 // : 5
x = -9/4/5
x = -9/20
x = -9/20
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