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x in (-oo:+oo)
1.25/8 = x/12 // - x/12
1.25/8-(x/12) = 0
0.15625-1/12*x = 0 // - 0.15625
-1/12*x = -0.15625 // : -1/12
x = -0.15625/(-1/12)
x = 1.87500008
x = 1.87500008
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