Please check my answer: Math

Solve: 7r - 7 = 2r + 18

My answer:
7r - 7r - 7 = 2r - 7r + 18
-7 = -5r + 18
-7 - 18 = -5r + 18 - 18
-25/-5 = -5r/-5

R = 5

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