Ответ:
(14.2+x)-1.43=20
14.2+x-1.43=20
12.77+x=20
x=20-12.77
x=7.23
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Ответ:
(14.2+x)-1.43=20
14.2+x-1.43=20
12.77+x=20
x=20-12.77
x=7.23