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b) x-2x+3 = -x+3
c) 3x-y+2x = 5x-y
d) -3a-6-4 = -3a-10
e) -2x+1-3x-1 = -5x
f) 4a-7b-2a-3b = 2a-10b
g) 2p-r+2r-p = p+r
h) x+y+x-z+z-y = 2x