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Simplifying 1 + -1r = 1 + -3r Add '-1' to each side of the equation. 1 + -1 + -1r = 1 + -1 + -3r Combine like terms: 1 + -1 = 0 0 + -1r = 1 + -1 + -3r -1r = 1 + -1 + -3r Combine like terms: 1 + -1 = 0 -1r = 0 + -3r -1r = -3r Solving -1r = -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. -1r + 3r = -3r + 3r Combine like terms: -1r + 3r = 2r 2r = -3r + 3r Combine like terms: -3r + 3r = 0 2r = 0 Divide each side by '2'. r = 0 Simplifying r = 0
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