Bjr
15/45 = 5x3/5x3x3 = 1/3
et
-140/210 = -2x7x10/3x7x10 = -2/3
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Bjr
15/45 = 5x3/5x3x3 = 1/3
et
-140/210 = -2x7x10/3x7x10 = -2/3