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Simplifying r = 4r + 10(2r) + -8r Remove parenthesis around (2r) r = 4r + 10 * 2r + -8r Multiply 10 * 2 r = 4r + 20r + -8r Combine like terms: 4r + 20r = 24r r = 24r + -8r Combine like terms: 24r + -8r = 16r r = 16r Solving r = 16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16r' to each side of the equation. r + -16r = 16r + -16r Combine like terms: r + -16r = -15r -15r = 16r + -16r Combine like terms: 16r + -16r = 0 -15r = 0 Divide each side by '-15'. r = 0 Simplifying r = 0
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