(21+3*х):9-3=3
(21+3*х):9=6
21+3*x=54
3*x=33
x=11
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(21+3*х):9-3=3
(21+3*х):9=6
21+3*x=54
3*x=33
x=11
3•х=60
Х=60:3
Х=20
(21+3•20):9-3=3
3=3
Ответ : х=20