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b) 5x do 3 - 10 x do 2 + 2
c) 2(15x do 2 + 6x - 5 x -2) = 30x do 2 + 2x -4
d) 21x -14y + 28 - 18x - 6y +4 = 3x - 20y +32
( 3x - 2y + 1) -( 8x + 3y - 7)=
3x - 2y + 1 - 8x - 3y + 7=
- 5x - 5y + 8
b)
2( 8x - 2y + 3) + 2(7x - 3y -2)=
16x - 4y + 6 + 14x - 6y - 4=
30x - 10 y +2
c)
(10
5
d)
2( 3x - 1)( 5x + 2) = (6x -2)( 5x + 2)=
e)
7 ( 3x - 2y +4) - 2( 9x + 3y - 2)=
21x - 14y + 28 - 18x - 6y + 4=
3x - 20y + 32