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-12 - 36 = 2x - x
- 48 = x
x = -48\
2. - 5x - 4x + 10 = 1
-9x + 10 = 1
-9x = -9
x = 1
3. 2 + x/4 = 5
x/4 = 5 - 3
x/4 = 3
x = 4 x 3
x = 12