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b. 15y - 10y + 25y = 30y ( karena variabelnya sama yaitu sama sama y )c. 15a2 +3a +9a2 = 3a ( 5a + 1 + 3a )
d. 14(a+2b) - 9(2a-b) = 14a + 28ab – 18a -9b = 28 ab +14a – 18a -9b= 28ab – 4a -9b