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Simplifying 20 + -2r = 8(8 + -3r) 20 + -2r = (8 * 8 + -3r * 8) 20 + -2r = (64 + -24r) Solving 20 + -2r = 64 + -24r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '24r' to each side of the equation. 20 + -2r + 24r = 64 + -24r + 24r Combine like terms: -2r + 24r = 22r 20 + 22r = 64 + -24r + 24r Combine like terms: -24r + 24r = 0 20 + 22r = 64 + 0 20 + 22r = 64 Add '-20' to each side of the equation. 20 + -20 + 22r = 64 + -20 Combine like terms: 20 + -20 = 0 0 + 22r = 64 + -20 22r = 64 + -20 Combine like terms: 64 + -20 = 44 22r = 44 Divide each side by '22'. r = 2 Simplifying r = 2
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