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Simplifying 4x + -9 + -8x + 2 + 9r = 13 Reorder the terms: -9 + 2 + 9r + 4x + -8x = 13 Combine like terms: -9 + 2 = -7 -7 + 9r + 4x + -8x = 13 Combine like terms: 4x + -8x = -4x -7 + 9r + -4x = 13 Solving -7 + 9r + -4x = 13 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 + 9r + 7 + -4x = 13 + 7 Reorder the terms: -7 + 7 + 9r + -4x = 13 + 7 Combine like terms: -7 + 7 = 0 0 + 9r + -4x = 13 + 7 9r + -4x = 13 + 7 Combine like terms: 13 + 7 = 20 9r + -4x = 20 Add '4x' to each side of the equation. 9r + -4x + 4x = 20 + 4x Combine like terms: -4x + 4x = 0 9r + 0 = 20 + 4x 9r = 20 + 4x Divide each side by '9'. r = 2.222222222 + 0.4444444444x Simplifying r = 2.222222222 + 0.4444444444x
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