1) Докажите тождество:
1. 2а – (4b – а) + (5b – 3а) = b
2. 6(а – 2) – 3(2а – 5) = 3
3. x*(a+b) + a*(b-x) = b*(a+x)
4. 6x(x–2)-4(2y+8x) = 6x2+2(10x-4y)

Помогите пожалуйста
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