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2013-04-04T20:03:21+02:00

a) 3(x-6) =18

3x -18 = 18

3x = +18 +18

3x = +36

x = 36/3

x= 12

 

b) -5(2x+3) = -25

-10x -15 = -25

-10x = 15 -25

-10x = -10

x = -10/10

x=-1

 

c) 4 +(2-y) = 20

4 +2 -y = 20

6 -y = 20

-y = -6 +20

-y = 14

y = -14

 

d) 1-3(2x +4) = -22

1 -6x -12 = -22

1 -12 -6x = -22

-11 -6x = -22

-6x = +11 -22

-6x = -11

x= -11/6