(8,9+х):3,4=8,5
8,9+х=8,5*3,4
8,9+х=28,9
х=28,9-8,9
х=20
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(8,9+х):3,4=8,5
8,9+х=8,5*3,4
8,9+х=28,9
х=28,9-8,9
х=20