3(a-b)-5(a-2b+1) (7a-2b)-[6a-(5b-2c)]+2cRT,3(a-b)-5(a-2b+1) (7a-2b)-[6a-(5b-2c)]+2c

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3(a-b)-5(a-2b+1) (7a-2b)-[6a-(5b-2c)]+2c
RT,
3(a-b)-5(a-2b+1)
(7a-2b)-[6a-(5b-2c)]+2c

3(a-b)-5(a-2b+1)
=3a-3b-5a+10b-5
=3a-5a+10b-3b-5
=-2a+7b-5
(7a-2b)-[6a-(5b-2c)]+2c
=7a-2b-6a+(5b-2c)+2c
=7a-2b-6a+5b-2c+2c
=7a-6a+5b-2b
=a+3b