Rozwiąż równanie:
1 - 2x + 5 = 4
1-2x+5=4
6-2x=4
-2x=4-6
-2x=(-2)//:-2
x=1
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1-2x+5=4
6-2x=4
-2x=4-6
-2x=(-2)//:-2
x=1