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-2 -2a +3 = -2a + 1
b)
2a - 3b + 3a - 2b = 5a - 5b
c)
2y-6y+4x-2x = 2x - 4y
d)
2x + 3 - 6x - 10 = -4x - 7
e)
-x+2x+(-6)+x-4 = 2x - 10
5a-5b
2x-4y
-4x-7
2x-10