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2014-11-15T19:30:20+02:00
15x-30 + 12 - 8x = 5x-8 
7x - 18 = 5x - 8 | -5x 
2x - 18 = - 8 | + 18
2x = 10 | :2
x=5
2014-11-15T19:36:56+02:00
15x - 30 + 12 - 8x = 5x - 8
15x - 8x - 5x = 30 - 12 - 8
2x = 10
x = 10 : 2
x = 5