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b)8a+a
c)zy+7z+2yz-1z
b)(2a+3)(4-3a) = 8a - 6a + 12 -9a = -11a + 12
c)z(y+7)(2y-1) = z (3y -y + 14y -7) = 3yz -zy +14yz -7z
b)(2a+3)(4-3a) = 8a+6a+12-9a = 14a-9a +12 = 5a+12
c)z(y+7)(2y-1) = z(2y²-y+14y-7)= 2y²z-yz+14yz-7z=2y²z + 13yz-7z