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x in (-oo:+oo)
x/4 = 8.1 // - 8.1
x/4-8.1 = 0
1/4*x-8.1 = 0 // + 8.1
1/4*x = 8.1 // : 1/4
x = 8.1/1/4
x = 32.4
x = 32.4
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