Answer:
1.- m = 13
2.-
3.- y = 3
Explanation:
In all cases we need to start with an equation or an inequality and slove for the variable:
Case 1. : 2 m - 13 = m + 3
Case 2. : 2 x + 1 > 8 x + 5 + 20
Case 3. : 9 - y = 2 y
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