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Simplifying 4 = r + 7 + -2 Reorder the terms: 4 = 7 + -2 + r Combine like terms: 7 + -2 = 5 4 = 5 + r Solving 4 = 5 + 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 = 5 + r + -1r Combine like terms: r + -1r = 0 4 + -1r = 5 + 0 4 + -1r = 5 Add '-4' to each side of the equation. 4 + -4 + -1r = 5 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 5 + -4 -1r = 5 + -4 Combine like terms: 5 + -4 = 1 -1r = 1 Divide each side by '-1'. r = -1 Simplifying r = -1
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