Question

45+30-x=12 как решить уровнем

Answer 1

45+30-х=12                                                                         45+30=75
75-х=12
х=75-12                                                                               75-12=63
х=63
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45+30-63= 12                                                                      45+30=75

 12=12                                                                                     75-63=12