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Simplifying 3 = 7 + r(3) Reorder the terms for easier multiplication: 3 = 7 + 3r Solving 3 = 7 + 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. 3 + -3r = 7 + 3r + -3r Combine like terms: 3r + -3r = 0 3 + -3r = 7 + 0 3 + -3r = 7 Add '-3' to each side of the equation. 3 + -3 + -3r = 7 + -3 Combine like terms: 3 + -3 = 0 0 + -3r = 7 + -3 -3r = 7 + -3 Combine like terms: 7 + -3 = 4 -3r = 4 Divide each side by '-3'. r = -1.333333333 Simplifying r = -1.333333333
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