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x in (-oo:+oo)
x/12 = 7.5/3 // - 7.5/3
x/12-(7.5/3) = 0
x/12-2.5 = 0
1/12*x-2.5 = 0 // + 2.5
1/12*x = 2.5 // : 1/12
x = 2.5/1/12
x = 30.0000012
x = 30.0000012
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