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x in (-oo:+oo)
1.2*x = 9/20 // - 9/20
1.2*x-(9/20) = 0
1.2*x-9/20 = 0
1.2*x-9/20 = 0 // + 9/20
1.2*x = 9/20 // : 1.2
x = 9/20/1.2
x = 0.375
x = 0.375
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