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x in (-oo:+oo)
x/3-2.5 = 5 // - 5
x/3-5-2.5 = 0
1/3*x-7.5 = 0 // + 7.5
1/3*x = 7.5 // : 1/3
x = 7.5/1/3
x = 22.50000023
x = 22.50000023
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