(3х+5х)*18 = 144
8х*18=144
8х=144:18
8х=8
х=8:8
х=1
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(3х+5х)*18 = 144
8х*18=144
8х=144:18
8х=8
х=8:8
х=1
8х=144:18
8х=8
Х=8:8
Х=1
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Ответ :8 вроде так