1.5×+15=2×+1
2.8-2×=3×-1
3.7×-3=5×+7
4.3+7×=4×-6
5.3×+2=×+4
2.8-2×=3×-1
3.7×-3=5×+7
4.3+7×=4×-6
5.3×+2=×+4
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