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x = - 6 + 2
x = - 4
-------------------------
8 = x - 25
- x = - 25 - 8
- x = - 33
x = 33
-----------------------------
30 + y = - 12
y = - 12 - 30
y = - 42
----------------------------
315 = 216 + t
- t = 216 - 315
- t = - 99
t = 99