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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) 3⅔ = ½x - ⅓ /+⅓
4=½x /razy 2
8=x
Pozdrawiam :)