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x in (-oo:+oo)
x/3-12 = 0.5 // - 0.5
x/3-12-0.5 = 0
1/3*x-12.5 = 0 // + 12.5
1/3*x = 12.5 // : 1/3
x = 12.5/1/3
x = 37.50000038
x = 37.50000038
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