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Simplifying 16 + -4r + -8r = 1 + -7r Combine like terms: -4r + -8r = -12r 16 + -12r = 1 + -7r Solving 16 + -12r = 1 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 16 + -12r + 7r = 1 + -7r + 7r Combine like terms: -12r + 7r = -5r 16 + -5r = 1 + -7r + 7r Combine like terms: -7r + 7r = 0 16 + -5r = 1 + 0 16 + -5r = 1 Add '-16' to each side of the equation. 16 + -16 + -5r = 1 + -16 Combine like terms: 16 + -16 = 0 0 + -5r = 1 + -16 -5r = 1 + -16 Combine like terms: 1 + -16 = -15 -5r = -15 Divide each side by '-5'. r = 3 Simplifying r = 3
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