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Simplifying -13 + -3r = 8 + 4r Solving -13 + -3r = 8 + 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. -13 + -3r + -4r = 8 + 4r + -4r Combine like terms: -3r + -4r = -7r -13 + -7r = 8 + 4r + -4r Combine like terms: 4r + -4r = 0 -13 + -7r = 8 + 0 -13 + -7r = 8 Add '13' to each side of the equation. -13 + 13 + -7r = 8 + 13 Combine like terms: -13 + 13 = 0 0 + -7r = 8 + 13 -7r = 8 + 13 Combine like terms: 8 + 13 = 21 -7r = 21 Divide each side by '-7'. r = -3 Simplifying r = -3
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