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Simplifying 13 = -3 + 4r Solving 13 = -3 + 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 + -4r = -3 + 4r + -4r Combine like terms: 4r + -4r = 0 13 + -4r = -3 + 0 13 + -4r = -3 Add '-13' to each side of the equation. 13 + -13 + -4r = -3 + -13 Combine like terms: 13 + -13 = 0 0 + -4r = -3 + -13 -4r = -3 + -13 Combine like terms: -3 + -13 = -16 -4r = -16 Divide each side by '-4'. r = 4 Simplifying r = 4
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