X - 7/8 = - 5/12
let's get those denominators the same; 24 looks right.
X - 3*7/3*8 = - 5*2/2*12
X - 21/24 = - 10/24
add 21/24 to both sides
X = 11/24
check
11/24 - 21/24 = - 10/24
- 10/24 = - 10/24
or
- 5/12 = - 5/12
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