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Simplifying 8 + -4r = 47 + 9r Solving 8 + -4r = 47 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 8 + -4r + -9r = 47 + 9r + -9r Combine like terms: -4r + -9r = -13r 8 + -13r = 47 + 9r + -9r Combine like terms: 9r + -9r = 0 8 + -13r = 47 + 0 8 + -13r = 47 Add '-8' to each side of the equation. 8 + -8 + -13r = 47 + -8 Combine like terms: 8 + -8 = 0 0 + -13r = 47 + -8 -13r = 47 + -8 Combine like terms: 47 + -8 = 39 -13r = 39 Divide each side by '-13'. r = -3 Simplifying r = -3
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