-3p+3q-1=+( )=3q-( )括号里应该填什么

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-3p+3q-1=+()=3q-()括号里应该填什么-3p+3q-1=+()=3q-()括号里应该填什么-3p+3q-1=+()=3q-()括号里应该填什么-3p+3q-1=+(3q-3p-1)=3q

-3p+3q-1=+( )=3q-( )括号里应该填什么
-3p+3q-1=+( )=3q-( )括号里应该填什么

-3p+3q-1=+( )=3q-( )括号里应该填什么
-3p+3q-1=+(3q-3p-1 )=3q-(3p+1 )