х+2х+8=9
3х=9-8|:3
х=1/3
Доказательство:
1/3+2/3+8=9
3/3+8=9
1+8=9
9=9
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х+2х+8=9
3х=9-8|:3
х=1/3
Доказательство:
1/3+2/3+8=9
3/3+8=9
1+8=9
9=9