б)
х+у=5
х+у-5=5-5
х+у-5=0
в)
2х+5у=10
2х+5у-10=10-10
2х+5у-10=0
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б)
х+у=5
х+у-5=5-5
х+у-5=0
в)
2х+5у=10
2х+5у-10=10-10
2х+5у-10=0