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