Rozwiąż równania: a)2x+5=11 b)3x+(-1)=5 c)y-3=9-y d)4y+2=y-7
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2x+5=112x=11-52x=6x=6/2x=33x+(-1)=53x=5+13x=6x=6/3x=2y-3=9-yy-9+y=32y=3+92y=12y=12/2y=64y+2=y-74y-y+7=-23y=-2-73y=-9y=-9/3y=-3
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2x+5=11
2x=11-5
2x=6
x=6/2
x=3
3x+(-1)=5
3x=5+1
3x=6
x=6/3
x=2
y-3=9-y
y-9+y=3
2y=3+9
2y=12
y=12/2
y=6
4y+2=y-7
4y-y+7=-2
3y=-2-7
3y=-9
y=-9/3
y=-3