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Simplifying -21 = -7r + 4r Combine like terms: -7r + 4r = -3r -21 = -3r Solving -21 = -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. -21 + 3r = -3r + 3r Combine like terms: -3r + 3r = 0 -21 + 3r = 0 Add '21' to each side of the equation. -21 + 21 + 3r = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3r = 0 + 21 3r = 0 + 21 Combine like terms: 0 + 21 = 21 3r = 21 Divide each side by '3'. r = 7 Simplifying r = 7
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