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3y+18-y=2y+18
3y-y-2y=18-18
0=0
równanie tożsamościowe
i)(x-7)-2(3x+5)=3
x-7-6x-10=3
x-6x=3+7+10
-5x=20
x=-4
3y+18-y=2y+18
2y-2y=18-18
0=0
i)(x-7)-2(3x+5)=3
x-7-6x-10=3
-5x=3+10+7
-5x=20/:(-5)
x=-4
3y+18-y=2y+18
0y=0
i)(x-7)-2(3x+5)=3
x-7-6x-10=3
-5x=3+10+7
-5x=20
x=-4