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b. (2a-5)*(2a+6) = -3a*8a = -24a
c. (a-3b)*(a+x) = -3ab*ax = -3a{a la 2}bx
d. (1-a)*(a+1) = -1a*1a = 1a{a la dos}
e. (3ab-5x)*(3ab+2) = -2abx*5ab = -10a{a la 2}b{a la 2}x