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