Answer:
y=5
Explanation:
5y - 21 = 19 - 3y
+21. +21
5y=40-3y
+3y +3y
8y=40
divide 40 by 8
40/8=5
5
Add 3y on both sides
5y + 3y - 21 = 19
8y - 21 = 19
Add 21 on both sides
8y = 19 + 21
8y = 40
Divide 8 on both sides
y = 40/8
y = 5
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