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x in (-oo:+oo)
5*x-(3.2/4) = 1.8 // - 1.8
5*x-(3.2/4)-1.8 = 0
5*x-1.8-0.8 = 0
5*x-2.6 = 0 // + 2.6
5*x = 2.6 // : 5
x = 2.6/5
x = 0.52
x = 0.52
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