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Simplifying x + 2r + -7 = 8 Reorder the terms: -7 + 2r + x = 8 Solving -7 + 2r + x = 8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 2r + 7 + x = 8 + 7 Reorder the terms: -7 + 7 + 2r + x = 8 + 7 Combine like terms: -7 + 7 = 0 0 + 2r + x = 8 + 7 2r + x = 8 + 7 Combine like terms: 8 + 7 = 15 2r + x = 15 Add '-1x' to each side of the equation. 2r + x + -1x = 15 + -1x Combine like terms: x + -1x = 0 2r + 0 = 15 + -1x 2r = 15 + -1x Divide each side by '2'. r = 7.5 + -0.5x Simplifying r = 7.5 + -0.5x
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