2Y + 10 = 28
subtract 10 from both sides
2Y + 10 - 10 = 28 - 10
2Y = 18
divide both sides by 2
Y = 9
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check
2(9) + 10 = 28
18 + 10 = 28
28 = 28
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2y+5y=10 7y=10 y=10/7
-2y = 10 2y = -10 y = -5
y = 5
There are 2 unknowns
3y - 3 = 2y + 5 3y - 2y = 5 + 3 y = 8