14х+63+3х=114
14х+3х=114-63
17х=51
x = 3
Проверка:
14*3+63+9=114
114=114
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14х+63+3х=114
14х+3х=114-63
17х=51
x = 3
Проверка:
14*3+63+9=114
114=114