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2014-11-12T09:19:35+02:00
3x+1+9x=25
9x-3x=25-1
6x=24
x=24:6
x=4

9x+2x=55
11x=55
x=55:11
x=5

14 : x=7
x=14*7
x=98

X : 40 = 20
x=40*20
x=800

2014-11-12T09:20:25+02:00
3x+1+9x=25
12x=24
x=2
9x+2x=55
11x=55
x=5
14:x=7
x=2
x:40=20
x=20x40=800