To solve this equation, we need to find the value of the blank space that completes the equation "3r + __ = 180".
Since we know that "3r" represents a certain value, and the sum of "3r" and the value in the blank space equals 180, we can subtract "3r" from both sides of the equation to isolate the blank space.
3r + __ - 3r = 180 - 3r
The "3r" terms cancel out, leaving us with:
__ = 180 - 3r
Thus, the value of the blank space is 180 - 3r.
3r + __ = 180
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