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Simplifying -10r + -2r = 13 + 2r Combine like terms: -10r + -2r = -12r -12r = 13 + 2r Solving -12r = 13 + 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. -12r + -2r = 13 + 2r + -2r Combine like terms: -12r + -2r = -14r -14r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 -14r = 13 + 0 -14r = 13 Divide each side by '-14'. r = -0.9285714286 Simplifying r = -0.9285714286
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