pomusice w równaniu a pytanie to rozwiąż i sprawdzi
2x+3=15
-2x-7=11
2x=12
x=6
spr.
2*6+3=15
12+3=15
15=15
-2x=18
x=-9
-2*(-9)-7=11
18-7=11
11=11
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2x+3=15
2x=12
x=6
spr.
2*6+3=15
12+3=15
15=15
-2x-7=11
-2x=18
x=-9
spr.
-2*(-9)-7=11
18-7=11
11=11