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Simplifying -1(3 + -1r) = -7 + -3 + 2r (3 * -1 + -1r * -1) = -7 + -3 + 2r (-3 + 1r) = -7 + -3 + 2r Combine like terms: -7 + -3 = -10 -3 + 1r = -10 + 2r Solving -3 + 1r = -10 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -3 + 1r + -2r = -10 + 2r + -2r Combine like terms: 1r + -2r = -1r -3 + -1r = -10 + 2r + -2r Combine like terms: 2r + -2r = 0 -3 + -1r = -10 + 0 -3 + -1r = -10 Add '3' to each side of the equation. -3 + 3 + -1r = -10 + 3 Combine like terms: -3 + 3 = 0 0 + -1r = -10 + 3 -1r = -10 + 3 Combine like terms: -10 + 3 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7
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