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Simplifying 88 = -5r + -4(r + -4) Reorder the terms: 88 = -5r + -4(-4 + r) 88 = -5r + (-4 * -4 + r * -4) 88 = -5r + (16 + -4r) Reorder the terms: 88 = 16 + -5r + -4r Combine like terms: -5r + -4r = -9r 88 = 16 + -9r Solving 88 = 16 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. 88 + 9r = 16 + -9r + 9r Combine like terms: -9r + 9r = 0 88 + 9r = 16 + 0 88 + 9r = 16 Add '-88' to each side of the equation. 88 + -88 + 9r = 16 + -88 Combine like terms: 88 + -88 = 0 0 + 9r = 16 + -88 9r = 16 + -88 Combine like terms: 16 + -88 = -72 9r = -72 Divide each side by '9'. r = -8 Simplifying r = -8
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