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102 = 2x / :2
51 = x
b) 43=7+9x / -7
36 = 9x / :9
4= x
c)17=11-12x - 11
6 = - 12x / : (-12)
-0,5 = x
d) 3 i dwie trzecie= jedna druga x- jedna trzecia
3 2/3 = 1/2x - 1/3 / *3
11 = 0,5x - 1 / +1
12 = 0,5x / : 0,5
24 = x
-2x=97-5
-2x=92 /:(-2)
x= 46
b)43=7+9x
-9x=7-43
-9x= -36 /:(-9)
x= 0,25
c)17=11-12x
12x=17-11
12x=8 /: 12
x= 1,5
d) 3 i 2/3= 1/2 x- 1/3
-1/2x=-3 i 2/3- 1/3
-1/2x= 11/3-1/3
-1/2x=10/3 /: (-1/2)
x=-6 i 2/3
W ostatnim nie jestem pewna.