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Simplifying 2r + -12 = 30 + -4r Reorder the terms: -12 + 2r = 30 + -4r Solving -12 + 2r = 30 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -12 + 2r + 4r = 30 + -4r + 4r Combine like terms: 2r + 4r = 6r -12 + 6r = 30 + -4r + 4r Combine like terms: -4r + 4r = 0 -12 + 6r = 30 + 0 -12 + 6r = 30 Add '12' to each side of the equation. -12 + 12 + 6r = 30 + 12 Combine like terms: -12 + 12 = 0 0 + 6r = 30 + 12 6r = 30 + 12 Combine like terms: 30 + 12 = 42 6r = 42 Divide each side by '6'. r = 7 Simplifying r = 7
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