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i z kolejnymi przykładami robimy tak samo.
1) 9y-7=5y+5
9y-5y = 5+7
4y = 12
y = 3
2) -x+25 = 2x-2
3x = 27
x = 9
3) -9z-7 = -z-6
- 8z = 1
z = - 1/8