Question

12.(x-7)-7(3-x)=47

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Answer 1

`12.(x-7)-7(3-x)=47`

`12x - 84 -21 +7x =47`

`12x +7x = 47 +84+21`

`19x = 152`

`x = 152/19 =8`

Vậy `x=8`