verify the following please
(I) (3/4+-2/5)+ -7/10= 3/4 + (-2/5+-7/10)
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(3/4-2/5)-7/10 = 3/4+(-2/5-7/10)
(7/20)-7/10 = 3/4+(-11/10)
7/20-7/10 = 3/4-11/10
-7/20 = -7/20
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