3a-2b+3c-5=3a-( )=3a+( )

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3a-2b+3c-5=3a-( )=3a+( )

3a-2b+3c-5=3a-( )=3a+( )
3a-2b+3c-5=3a-( )=3a+( )

3a-2b+3c-5=3a-( )=3a+( )
3a-2b+3c-5=3a-(2b-3c+5)=3a+(-2b+3c-5 )