Уравнение!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question

Уравнение!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Answer 1

510:3-у=20
170-у=20
у=170-20
у=150
510:3-150=20

Answer 2

510/3 - y = 20
170 - y = 20
-y = 20-170
-y = -150
y = 150