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2014-04-10T21:11:18+02:00
X + 30 = 2 (x+5)
x + 30 = 2 x + 10
x - 2x = 10-30
- x = -20
x= 20
2014-04-10T21:42:10+02:00
X + 30 = 2 (x+5)
x + 30 = 2 x + 10
x - 2x = 10-30 
- x = -20 
x= 20 
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