z.8 str. 172
a) zrobiłem więc nie jest mi potrzebne.
b) 2 (u-5) +15 = 3 (u - 4) + 10
c) -3 (y/3 + 1) - 2 = 4 (1 - y)
d) 2 (3a - 2) - 6 = 4,5 (2a - 1) + 1/2
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b) 2(u-5) + 15 = 3(u-4) + 10
2u - 10 + 15 = 3u - 12 + 10
2u-3u = -2-5
-u=-7
u=7
c) -3(y/3 + 1) - 2 = 4(1 - y)
-y-3-2=4-4y
3y=9
y=3
d) 2(3a-2) - 6 = 4,5(2a-1) +1/2
6a-4-6 = 9a-4,5+ 0,5
-3a=6
a=-2