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-7ab + 5bc - 2bc + ab
=-7ab+ab+5bc-2bc
=-6ab+3bc
5cb + 5b²a - 2bc - 9ab²
=5cb-2bc+5b²a-9ab²
=3bc-4ab²
maaf ya kalo salahh :) cm ingin membantu
+ a^{2} = 8 a^{2} [/tex]
-7ab +5bc -2bc +ab = -6ab +3bc
5cb + 5 -2bc = 3bc