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Simplifying 4r + -3 = r + 21 Reorder the terms: -3 + 4r = r + 21 Reorder the terms: -3 + 4r = 21 + r Solving -3 + 4r = 21 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -3 + 4r + -1r = 21 + r + -1r Combine like terms: 4r + -1r = 3r -3 + 3r = 21 + r + -1r Combine like terms: r + -1r = 0 -3 + 3r = 21 + 0 -3 + 3r = 21 Add '3' to each side of the equation. -3 + 3 + 3r = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 3r = 21 + 3 3r = 21 + 3 Combine like terms: 21 + 3 = 24 3r = 24 Divide each side by '3'. r = 8 Simplifying r = 8
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