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Simplifying -7 = r + -2 + 1 Reorder the terms: -7 = -2 + 1 + r Combine like terms: -2 + 1 = -1 -7 = -1 + r Solving -7 = -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. -7 + -1r = -1 + r + -1r Combine like terms: r + -1r = 0 -7 + -1r = -1 + 0 -7 + -1r = -1 Add '7' to each side of the equation. -7 + 7 + -1r = -1 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = -1 + 7 -1r = -1 + 7 Combine like terms: -1 + 7 = 6 -1r = 6 Divide each side by '-1'. r = -6 Simplifying r = -6
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