7a-4b-[5a-3{b-2(a-b)}]

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7a -4b -3{5a -3*[b-2*(a-b)]} . . . =7a -4b -3{5a-3*[b-2a +2b]} . . . =7a -4b -3[5a -3*(3b-2a)] . . . =7a -4b -3(5a+6a -9b) . . . =7a -4b -3(11a -9b) . . . =7a -4b -33a +27b . . . =(7-33)a +(27-4)b . . . =-26a +23b
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