y = 3(x+1)/5
x = (5y - 3) / 3
5у-3х=3
3х=5у-3
х=(5у-3):3
5у=3+3х
у=(3+3х):5 или 3(1+х):5
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y = 3(x+1)/5
x = (5y - 3) / 3
5у-3х=3
3х=5у-3
х=(5у-3):3
5у-3х=3
5у=3+3х
у=(3+3х):5 или 3(1+х):5