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Simplifying 109 = r + -45 Reorder the terms: 109 = -45 + r Solving 109 = -45 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 109 + -1r = -45 + r + -1r Combine like terms: r + -1r = 0 109 + -1r = -45 + 0 109 + -1r = -45 Add '-109' to each side of the equation. 109 + -109 + -1r = -45 + -109 Combine like terms: 109 + -109 = 0 0 + -1r = -45 + -109 -1r = -45 + -109 Combine like terms: -45 + -109 = -154 -1r = -154 Divide each side by '-1'. r = 154 Simplifying r = 154
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