![x - 4 = 8 x - 4 = 8](https://tex.z-dn.net/?f=x+-+4+%3D+8)
![8 + 4 = 12 8 + 4 = 12](https://tex.z-dn.net/?f=8+%2B+4+%3D+12)
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x-4=8
x=8+4
x=12
8+4=12
12=12
x=8+4
x=12
8+4=12
12=12
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