1) -9x + 7x - 5x + 2x =
3) -3,8 - k + 3,8 + k =
5) m + m - m - m =
7) -8x + 5,2a + 3x + 5a =
9) x - y - x + y =
11) 23x - 23 + 40 + 4x =
13) -6,3m + 8 - 3,2m - 5 =
15) 0,2m - (-4m) + =
17) 0,7x - 6y - 2x + 0,8y =
19) 7,4x - 5,3y + 6,6x -3,7y =
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