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Simplifying 21 = 6r + 5 + -4r Reorder the terms: 21 = 5 + 6r + -4r Combine like terms: 6r + -4r = 2r 21 = 5 + 2r Solving 21 = 5 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 21 + -2r = 5 + 2r + -2r Combine like terms: 2r + -2r = 0 21 + -2r = 5 + 0 21 + -2r = 5 Add '-21' to each side of the equation. 21 + -21 + -2r = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -2r = 5 + -21 -2r = 5 + -21 Combine like terms: 5 + -21 = -16 -2r = -16 Divide each side by '-2'. r = 8 Simplifying r = 8
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