2х-5у=-7
х=-5+3у
2•(-5+3у)-5у=-7
-10+6у-5у=-7
у=-7+10
у=3
2х-5•3=-7
2х-15=-7
2х=-7+15
2х=8
х=4
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2х-5у=-7
х=-5+3у
2•(-5+3у)-5у=-7
-10+6у-5у=-7
у=-7+10
у=3
2х-5у=-7
у=3
2х-5•3=-7
2х-15=-7
2х=-7+15
2х=8
х=4
х=4
у=3