Объяснение:
rt=ts=4x
rs=7x
4x+4x+7x=45
15х=45
х=3
rt=ts=4x=12
rs=7x=21
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Объяснение:
rt=ts=4x
rs=7x
4x+4x+7x=45
15х=45
х=3
rt=ts=4x=12
rs=7x=21