3х+3=6
3х=6-3
3х=3
х=3:3
х=1
проверка 5*1-2*1+3=6, 3+3=6, 6=6
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3x=3
x=1
Ответ x=1
3х+3=6
3х=6-3
3х=3
х=3:3
х=1
проверка 5*1-2*1+3=6, 3+3=6, 6=6