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Simplifying 7(3 + -6r) = 357 (3 * 7 + -6r * 7) = 357 (21 + -42r) = 357 Solving 21 + -42r = 357 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -42r = 357 + -21 Combine like terms: 21 + -21 = 0 0 + -42r = 357 + -21 -42r = 357 + -21 Combine like terms: 357 + -21 = 336 -42r = 336 Divide each side by '-42'. r = -8 Simplifying r = -8
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