Answer :
Answer:
1. 29
2. 24
3. 50
4. 69
Step-by-step explanation:
You can replace blank with x, and isolate x for each equation by moving the numbers on the same side of the x to the other side by subtracting them.
For example, for 1.
[tex]43+x=53+19\\43-43+x=72-43 \\\\x=29[/tex]
subtract 43 by both sides to move it to right