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3. a) -3 y - 7y + 4y - 11y + 9y = -8y
b) 4x - 2 - 5x + 7 =4x - 5x - 2 + 7 = -1x + 5
4. x-2=8
x=8+2
x=10
5. a) 87=2x-5
87+5=2x
92=2x| :2
x=46
b) 2(5x-1)=8
10x-2=8
10x=8+2
10x=10 |:10
x=1
6,7,8 i 1 nie umiem.