First of all, let's agree on what the question is ...
The question is: What's the number for 'x' that makes this statement true ?
Here's how to find it:
11x - 4 = 7x + 16
Add 4 to each side:
11x = 7x + 20
Subtract 7x from each side:
4x = 20
Divide each side by 4:
x = 5
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