Ответ:
20х-10-12х+15=33
8х+5=33
8х=33-5
8х=28
Х=28:8
Х=3,5
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Ответ:
20х-10-12х+15=33
8х+5=33
8х=33-5
8х=28
Х=28:8
Х=3,5