SOLUTION: r+18=20

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Question 919118: r+18=20
Found 2 solutions by MathLover1, Kiera-Krum:
Answer by MathLover1(20850) About Me  (Show Source):
Answer by Kiera-Krum(1) About Me  (Show Source):
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r+18=20
r+18-18=20-18
r+18-18 =2 ( Cross out the 18 )

so the answer is (r=2)