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Simplifying 3r + -4 = 28 + -1r Reorder the terms: -4 + 3r = 28 + -1r Solving -4 + 3r = 28 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -4 + 3r + r = 28 + -1r + r Combine like terms: 3r + r = 4r -4 + 4r = 28 + -1r + r Combine like terms: -1r + r = 0 -4 + 4r = 28 + 0 -4 + 4r = 28 Add '4' to each side of the equation. -4 + 4 + 4r = 28 + 4 Combine like terms: -4 + 4 = 0 0 + 4r = 28 + 4 4r = 28 + 4 Combine like terms: 28 + 4 = 32 4r = 32 Divide each side by '4'. r = 8 Simplifying r = 8
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