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- 0.7r + 2 = - 4.2r - 1.5
- 0.7r + 4.2r = - 1.5 - 2
3.5r = - 3.5
r = - 3.5/3.5
r = - 1
4.2r - 0.7r = -1.5 - 2
3.5r = -3.5
r = -3.5/3.5
r = -1