3(x+1)=3x+3
3x+3 = 3x+3
3x-3x = 3-3
0 = 0
tożsamościowe
2x=5
x = 2,5
x-3=x+3
x-x = 3+3
0 = 6
sprzeczne
x+7=7+x
x-x = 7-7
x+5=5
x = 5-5
x = 0
6x+2=5x+2
6x-5x = 2-2
x+2(1-x)=3-x
x+2-2x = 3-x
x-2x+x = 3-2
0 = 1
-2(3-x)=2x-6
-6+2x = 2x-6
2x-2x = -6+6
2x = 0
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3(x+1)=3x+3
3x+3 = 3x+3
3x-3x = 3-3
0 = 0
tożsamościowe
2x=5
x = 2,5
x-3=x+3
x-x = 3+3
0 = 6
sprzeczne
x+7=7+x
x-x = 7-7
0 = 0
tożsamościowe
x+5=5
x = 5-5
x = 0
6x+2=5x+2
6x-5x = 2-2
x = 0
x+2(1-x)=3-x
x+2-2x = 3-x
x-2x+x = 3-2
0 = 1
sprzeczne
-2(3-x)=2x-6
-6+2x = 2x-6
2x-2x = -6+6
0 = 0
tożsamościowe
2x = 0
x = 0