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Simplifying r + -7 + 3r = 1 Reorder the terms: -7 + r + 3r = 1 Combine like terms: r + 3r = 4r -7 + 4r = 1 Solving -7 + 4r = 1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4r = 1 + 7 Combine like terms: -7 + 7 = 0 0 + 4r = 1 + 7 4r = 1 + 7 Combine like terms: 1 + 7 = 8 4r = 8 Divide each side by '4'. r = 2 Simplifying r = 2
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