Докажите тождество: 1) 12x+8-4x=2(4x+4)
2) 2a-(4+3b)=5a-(2a+4)-3b
3) 4-2(a-5)=-1,5(2a+6)
4) (a+b)-(a-b)=(a+b)-(a+b)-(a+b)+(a-b)
5) 3x+6+3=3+18x-9x
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