a) 29a + 4a - 21a=
33a - 21a=
12a
b) x + 3x + 5x - x - x =
9x - 2x=
7x
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a) 29a + 4a - 21a
29a - 21a + 4a
8a + 4a
12a
b) x + 3x - x + 5x - x
3x + 5x + x - x - x
8x - x
7x
a) 29a + 4a - 21a=
33a - 21a=
12a
b) x + 3x + 5x - x - x =
9x - 2x=
7x