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a) -7+3y+9+2y =2+5y
b) x-3x+2-2x-7 = -4x-5
c) -5x+4y-y-7x-9y =-12x-6y
d) 4x+5-x-4+x-3x =1+1x
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 =-1x+3y
j) 2y-5-3y-4-8y+9 =-9y