1) 178+а-78=178-78+а=100+а=100+222=322
2)
318-(100+х)=19
318-100-х=19
218-х=19
х=218-19
х=199
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1) 178+а-78=178-78+а=100+а=100+222=322
2)
318-(100+х)=19
318-100-х=19
218-х=19
х=218-19
х=199