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Simplifying -7 = r + 2 Reorder the terms: -7 = 2 + r Solving -7 = 2 + 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. -7 + -1r = 2 + r + -1r Combine like terms: r + -1r = 0 -7 + -1r = 2 + 0 -7 + -1r = 2 Add '7' to each side of the equation. -7 + 7 + -1r = 2 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = 2 + 7 -1r = 2 + 7 Combine like terms: 2 + 7 = 9 -1r = 9 Divide each side by '-1'. r = -9 Simplifying r = -9
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