4x(x-3)=0
4x=0 или x-3=0
x=0 или x=3
отв:0;3
6a²-10a-(a²-7a-3a+21)=6a²-10a-a²+7a+3a-21=5a²-21
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4x(x-3)=0
4x=0 или x-3=0
x=0 или x=3
отв:0;3
6a²-10a-(a²-7a-3a+21)=6a²-10a-a²+7a+3a-21=5a²-21