"1: Before you make any decision you must take all the consequences into consideration that it can have. " I don't like the first sentence because "that it can have" is separated from "consequences", also I'd use "may have". Your second sentence is better, though I'd say: "Before making any decision you must consider all the consequences that it may have", or "all its possible consequences".
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"1: Before you make any decision you must take all the consequences into consideration that it can have. 2: Before you make any decision you must take all the consquences of it into consideration." I don't like the first sentence because "that it can have" is separated from "consequences", also I'd use "may have". Your second sentence is better, tho