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Simplifying 8(-5 + -2) + 20r = -16 + -20r Combine like terms: -5 + -2 = -7 8(-7) + 20r = -16 + -20r Multiply 8 * -7 -56 + 20r = -16 + -20r Solving -56 + 20r = -16 + -20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20r' to each side of the equation. -56 + 20r + 20r = -16 + -20r + 20r Combine like terms: 20r + 20r = 40r -56 + 40r = -16 + -20r + 20r Combine like terms: -20r + 20r = 0 -56 + 40r = -16 + 0 -56 + 40r = -16 Add '56' to each side of the equation. -56 + 56 + 40r = -16 + 56 Combine like terms: -56 + 56 = 0 0 + 40r = -16 + 56 40r = -16 + 56 Combine like terms: -16 + 56 = 40 40r = 40 Divide each side by '40'. r = 1 Simplifying r = 1
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