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Simplifying 4 = r + -1 Reorder the terms: 4 = -1 + r Solving 4 = -1 + 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. 4 + -1r = -1 + r + -1r Combine like terms: r + -1r = 0 4 + -1r = -1 + 0 4 + -1r = -1 Add '-4' to each side of the equation. 4 + -4 + -1r = -1 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = -1 + -4 -1r = -1 + -4 Combine like terms: -1 + -4 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5
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