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2014-11-16T12:57:19+02:00
30 - 10x + 6x + 12 = 13 + 14x - 7
- 10x + 6x - 14x = 13 - 7 - 30 - 12
- 18x = - 36
x = 36 : 18
x = 2
2 4 2