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1(×-10)/4 = 2(×-5)/3
×-10/4 = 2×-10/3
×-10/4 - 2×-10/3 = 0
3(×-10)/12 - 4(2×-10)/12 = 0
3×-30/12 - 8×+40/12 = 0
-5×+10/12 = 0
-5×+10 = 12
-5× = 12-10
-5× = 2
× = 2/-5
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