2*x=18-x
2*6=18-6
12=12
x=6
2x=18-x
2x+x=18
3x=18
X=18:3
X=6
Проверка:
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2*x=18-x
2*6=18-6
12=12
x=6
2x=18-x
2x+x=18
3x=18
X=18:3
X=6
Проверка:
2*6=18-6
12=12