-{7a+[4a-7b-(2a-6a-4b)]-3a},a=-2/3 b=2/5
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-{7a+[4a-7b-(2a-6a-4b)]-3a},a=-2/3 b=2/5
![-{7a+[4a-7b-(2a-6a-4b)]-3a},a=-2/3 b=2/5](/uploads/image/z/19228982-14-2.jpg?t=-%7B7a%2B%5B4a-7b-%282a-6a-4b%29%5D-3a%7D%2Ca%3D-2%2F3+b%3D2%2F5)
-{7a+[4a-7b-(2a-6a-4b)]-3a}
=-{7a+4a-7b-2a+6a+4b-3a}
=-(12a-3b)
=3b-12a
=3*2/5+12*2/3
=1.2+8
=9.2
=-{7a+4a-7b-2a+6a+4b-3a}
=-(12a-3b)
=3b-12a
=3*2/5+12*2/3
=1.2+8
=9.2
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