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Solve the following equation
r+r+0.45=1.25
Solve for r
r + r + 0.45 = 1.25
(1 + 1)r = 2r
2r + 0.45 = + 1.25
Group our constants 0.45 and 1.25. subtract 0.45 from both sides
2r + 0.45 - 0.45 = 1.25 - 0.45
2r = 0.8
r = 0.4
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