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x in (-oo:+oo)
x/8 = 2.5/0.3 // - 2.5/0.3
x/8-(2.5/0.3) = 0
x/8-8.33333333 = 0
1/8*x-8.33333333 = 0 // + 8.33333333
1/8*x = 8.33333333 // : 1/8
x = 8.33333333/1/8
x = 66.66666664
x = 66.66666664
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