Bonjour pouvez vous m'aidez: Développer puis réduire les expressions

3(a-6)-6a=

4a-7+a(2a+3)=

5(3a-5)+3(7-2a)=

4(5-a)+2(2a-6)=

a(3a-4)+a(5-6a)=

merci d'avance
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