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Simplifying -1r + -9 = r + -3 Reorder the terms: -9 + -1r = r + -3 Reorder the terms: -9 + -1r = -3 + r Solving -9 + -1r = -3 + 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. -9 + -1r + -1r = -3 + r + -1r Combine like terms: -1r + -1r = -2r -9 + -2r = -3 + r + -1r Combine like terms: r + -1r = 0 -9 + -2r = -3 + 0 -9 + -2r = -3 Add '9' to each side of the equation. -9 + 9 + -2r = -3 + 9 Combine like terms: -9 + 9 = 0 0 + -2r = -3 + 9 -2r = -3 + 9 Combine like terms: -3 + 9 = 6 -2r = 6 Divide each side by '-2'. r = -3 Simplifying r = -3
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