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x+2=8 obustronnie odejmujemy 2
x=6
2x+ 2x- 3x= 8 + 5 - 7
x= 6
b) 2y- 2 + 3y - 5y + 2 - y = 4
2y + 3y - 55y= 4 - 2 - 2
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x+2=8 | -2
x=6