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x in (-oo:+oo)
x/3 = 3.75 // - 3.75
x/3-3.75 = 0
1/3*x-3.75 = 0 // + 3.75
1/3*x = 3.75 // : 1/3
x = 3.75/1/3
x = 11.25000011
x = 11.25000011
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