(7a-2b)-【6a-(5b-2c)】+2c=

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(7a-2b)-【6a-(5b-2c)】+2c=

(7a-2b)-【6a-(5b-2c)】+2c=
(7a-2b)-【6a-(5b-2c)】+2c=

(7a-2b)-【6a-(5b-2c)】+2c=
(7a-2b)-【6a-(5b-2c)】+2c
=7a-2b-6a+5b-2c+2c
=a+3b