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b) x - 3x + 2 - 2x - 7=-4x-5
c) -5x + 4y - y - 7x - 9y=-12x-6y
d) 4x + 5 - x - 4 + x - 3x=x+1
e) 0,5a - 2a + 9 - 0,5a - 11,5=-2a-2,5
f) -14k + 9k - 13 + k + 3 + 4k=-10
g) -3k + 2m + 5m - 7 + k - m=-2k+6m-7
h) 2x - 4 + 3x -2=5x-6
i) x - 3y - 2x + 6y=-x+3y
j) 2y - 5 - 3y - 4 - 8y - 9=-9y-18