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Simplifying 12r + -8 = -3r + 21 Reorder the terms: -8 + 12r = -3r + 21 Reorder the terms: -8 + 12r = 21 + -3r Solving -8 + 12r = 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. -8 + 12r + 3r = 21 + -3r + 3r Combine like terms: 12r + 3r = 15r -8 + 15r = 21 + -3r + 3r Combine like terms: -3r + 3r = 0 -8 + 15r = 21 + 0 -8 + 15r = 21 Add '8' to each side of the equation. -8 + 8 + 15r = 21 + 8 Combine like terms: -8 + 8 = 0 0 + 15r = 21 + 8 15r = 21 + 8 Combine like terms: 21 + 8 = 29 15r = 29 Divide each side by '15'. r = 1.933333333 Simplifying r = 1.933333333
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