Решите
2х+3х+7=47
С проверкой
5х=47-7
5х=40
х=40:5
х=8
____________
2*8+3*8+7=47
16+24+7=47
47=47
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2х+3х+7=47
5х=47-7
5х=40
х=40:5
х=8
____________
2*8+3*8+7=47
16+24+7=47
47=47