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Simplifying 4x + -9 + -8 + 2 + 9r = 13 Reorder the terms: -9 + -8 + 2 + 9r + 4x = 13 Combine like terms: -9 + -8 = -17 -17 + 2 + 9r + 4x = 13 Combine like terms: -17 + 2 = -15 -15 + 9r + 4x = 13 Solving -15 + 9r + 4x = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 9r + 15 + 4x = 13 + 15 Reorder the terms: -15 + 15 + 9r + 4x = 13 + 15 Combine like terms: -15 + 15 = 0 0 + 9r + 4x = 13 + 15 9r + 4x = 13 + 15 Combine like terms: 13 + 15 = 28 9r + 4x = 28 Add '-4x' to each side of the equation. 9r + 4x + -4x = 28 + -4x Combine like terms: 4x + -4x = 0 9r + 0 = 28 + -4x 9r = 28 + -4x Divide each side by '9'. r = 3.111111111 + -0.4444444444x Simplifying r = 3.111111111 + -0.4444444444x
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