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Simplifying -9r + 42 + 7r = -30 Reorder the terms: 42 + -9r + 7r = -30 Combine like terms: -9r + 7r = -2r 42 + -2r = -30 Solving 42 + -2r = -30 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + -2r = -30 + -42 Combine like terms: 42 + -42 = 0 0 + -2r = -30 + -42 -2r = -30 + -42 Combine like terms: -30 + -42 = -72 -2r = -72 Divide each side by '-2'. r = 36 Simplifying r = 36
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