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Simplifying 3r + 30 + -1r = 4 Reorder the terms: 30 + 3r + -1r = 4 Combine like terms: 3r + -1r = 2r 30 + 2r = 4 Solving 30 + 2r = 4 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 2r = 4 + -30 Combine like terms: 30 + -30 = 0 0 + 2r = 4 + -30 2r = 4 + -30 Combine like terms: 4 + -30 = -26 2r = -26 Divide each side by '2'. r = -13 Simplifying r = -13
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