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x in (-oo:+oo)
x/4 = 3.2 // - 3.2
x/4-3.2 = 0
1/4*x-3.2 = 0 // + 3.2
1/4*x = 3.2 // : 1/4
x = 3.2/1/4
x = 12.8
x = 12.8
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