Реши уравнения:
1) 63×(80-а)=693
2) (х+420) :8=56
3)700-х=56×8
4)а-10=2352:98

ОБРАЗЕЦ:

(х+420):8=56
х+420:8×8=56×8
х+420=448
х+420-420=448-420
х=28
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