Question 48999
1.(7x-2y+5)+(2x+5y-4) [Combine like-terms only]
9x+3y+1 
.
2.(3x+5xy+2y)+(4-3xy-2x) [Combine like-terms only]
x+2xy+2y+4 
.

3.  -2[2a-(4a-2)-2(7-3a)]    [Use the order of operations (PEMDAS)]

-2[2a-4a+2)-2(7-3a)][Multiply within the brackets]

-2[2a - 4a + 2 - 14 + 6a] [Combine like-terms]

-2[-2a - 12 + 6a)]   [Combine like-terms]

-2[4a - 12]  [Multiply outside of the brackets]

-8a + 24