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Simplifying 7 = 3r + 28 Reorder the terms: 7 = 28 + 3r Solving 7 = 28 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 7 + -3r = 28 + 3r + -3r Combine like terms: 3r + -3r = 0 7 + -3r = 28 + 0 7 + -3r = 28 Add '-7' to each side of the equation. 7 + -7 + -3r = 28 + -7 Combine like terms: 7 + -7 = 0 0 + -3r = 28 + -7 -3r = 28 + -7 Combine like terms: 28 + -7 = 21 -3r = 21 Divide each side by '-3'. r = -7 Simplifying r = -7
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