(2 by 5+ -3 by 7)+ -7 by 10= 2 by 5 + (-3 by 7 + -7 by 10)
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(2 by 5+ -3 by 7)+ -7 by 10= 2 by 5 + (-3 by 7 + -7 by 10)= 5 by 6
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10-21-70=10-21-70
-81=-81
This is true that (2×5+(-3×7)+(-7))×10=2×5+((-3)×7+(-7×10))
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