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Simplifying 130 + -40 = 65 + r Combine like terms: 130 + -40 = 90 90 = 65 + r Solving 90 = 65 + 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. 90 + -1r = 65 + r + -1r Combine like terms: r + -1r = 0 90 + -1r = 65 + 0 90 + -1r = 65 Add '-90' to each side of the equation. 90 + -90 + -1r = 65 + -90 Combine like terms: 90 + -90 = 0 0 + -1r = 65 + -90 -1r = 65 + -90 Combine like terms: 65 + -90 = -25 -1r = -25 Divide each side by '-1'. r = 25 Simplifying r = 25
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