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2013-04-04T18:54:51+02:00
1 : 3x/3 = 12/3
x = 4

2 : -10x = 2
-10x/10 = 2/10
x = 2/10 = 0,2
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2013-04-04T18:54:52+02:00

3x = 12 

x = 12/3= 4

 

 

3-10x = 5

-10x = 5-3

-10x= 2

x = -0.2

 

 

 

x+7=12

x=12-7

x= 5

 

 

t-51=-30

t= -30+51

t=21