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x in (-oo:+oo)
x/4 = 5.12 // - 5.12
x/4-5.12 = 0
1/4*x-5.12 = 0 // + 5.12
1/4*x = 5.12 // : 1/4
x = 5.12/1/4
x = 20.48
x = 20.48
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