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Simplifying (3r + 1) + -10 = -45 Reorder the terms: (1 + 3r) + -10 = -45 Remove parenthesis around (1 + 3r) 1 + 3r + -10 = -45 Reorder the terms: 1 + -10 + 3r = -45 Combine like terms: 1 + -10 = -9 -9 + 3r = -45 Solving -9 + 3r = -45 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3r = -45 + 9 Combine like terms: -9 + 9 = 0 0 + 3r = -45 + 9 3r = -45 + 9 Combine like terms: -45 + 9 = -36 3r = -36 Divide each side by '3'. r = -12 Simplifying r = -12
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