Пж пж помогите

Question

Пж пж помогите

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Answer 1

(450-300)*х=450
150*х=450
х=450:150
х=3

х-(315-245)=526
х-70=526
х=526+70
х=596

(859-259):х=200
600:х=200
х=600:200
х=300

Answer 2

1)(450-300)*х=450
450-300=150
150*х=450
х=450:150
х=3