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Simplifying 3r(2) + -21 = -18r Reorder the terms for easier multiplication: 3 * 2r + -21 = -18r Multiply 3 * 2 6r + -21 = -18r Reorder the terms: -21 + 6r = -18r Solving -21 + 6r = -18r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18r' to each side of the equation. -21 + 6r + 18r = -18r + 18r Combine like terms: 6r + 18r = 24r -21 + 24r = -18r + 18r Combine like terms: -18r + 18r = 0 -21 + 24r = 0 Add '21' to each side of the equation. -21 + 21 + 24r = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 24r = 0 + 21 24r = 0 + 21 Combine like terms: 0 + 21 = 21 24r = 21 Divide each side by '24'. r = 0.875 Simplifying r = 0.875
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