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a. 6 + 2x + 15x + 5x" = 6 + 17x + 5x"
b. 6 - 2x - 15x + 5x" = 6 -17x + 5x"
c, 6 - 2x + 15x - 5x" = 6 + 13x - 5x"
d. 6 + 2x -15x - 5x" = 6x - 13x - 5x"