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x in (-oo:+oo)
1.5*x = 9/4 // - 9/4
1.5*x-(9/4) = 0
1.5*x-9/4 = 0
1.5*x-9/4 = 0 // + 9/4
1.5*x = 9/4 // : 1.5
x = 9/4/1.5
x = 1.5
x = 1.5
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