Hi :)
Equation : 
First Add 13 to both sides

The second step is to divide both sides by 8

We have our answer
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I would estimate this around 960 since 318 is close to 320 and 320x3 is 960, the actual answer would be 3x318 which is 954.
1, because 1 1/3 is only 1/3, or 0.3 recurring, away from 1, but it is 2/3, or 0.6 recurring, away from 2.
That'd be 32 with no remainder.