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Simplifying -7(3 + r) = 21 (3 * -7 + r * -7) = 21 (-21 + -7r) = 21 Solving -21 + -7r = 21 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 + -7r = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -7r = 21 + 21 -7r = 21 + 21 Combine like terms: 21 + 21 = 42 -7r = 42 Divide each side by '-7'. r = -6 Simplifying r = -6
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