5Х+2Х=84:2
7Х=42
х=6
5Х=5×6=30
2х=2×6=12
S=30×12=360
Ответ:360
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5Х+2Х=84:2
7Х=42
х=6
5Х=5×6=30
2х=2×6=12
S=30×12=360
Ответ:360