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(x+y) is the same as x+y
3(x+y) is 3 times as much. You multiply both x and y with 3 = 3x+3y
3(2x+4y) is the same as 3*2x+3*4y = 6x+12y
This is the general start of how to "solve" and do calculations with parentheses.
I am sure other people can add more examples with higher difficulty
Regards.
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