Хелп!!!!!!!!!!,плиз,хелп

Question

Хелп!!!!!!!!!!,плиз,хелп

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Answer 1

50*у-72=78
50*у=72+78
50*у=150
у=150:50
у=3

Answer 2

50*у-72=78
50*y=72+78
y=150:50
y=3
50*3-72=78