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3u = -9 /:3
u = -3
b) -t+2 = 4 +5t
-6t = 2 /:(-6)
t = -1/3
c) 2w + 3 = 4w -5
-2w = -8 /:(-2)
w = 4
d) jedna czwarta y - 3 = 2
1/4 y = 5 /*4
y = 20
3u+2=-7 |-2
3u=-9 |:3
u=-3
b) -t+2 = 4 +5t |-5t
-6t+2=4 |-2
-6t=2
t=-1/3
c) 2w + 3 = 4w -5 |-2w
3=2-5 |+5
8=2w |:2
w=4
d) 1/4y - 3 = 2 |+3
1/4y=5 |*4
y=20