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