11х+10х=168
21х=168
х=168/21
x=8
18x-x=51
17x=51
x=51/17
x=3
x+9x-3x=147
7x=147
x=21
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11х+10х=168
21х=168
х=168/21
x=8
18x-x=51
17x=51
x=51/17
x=3
x+9x-3x=147
7x=147
x=21