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Simplifying 9r = 3r + -4(r + -20) Reorder the terms: 9r = 3r + -4(-20 + r) 9r = 3r + (-20 * -4 + r * -4) 9r = 3r + (80 + -4r) Reorder the terms: 9r = 80 + 3r + -4r Combine like terms: 3r + -4r = -1r 9r = 80 + -1r Solving 9r = 80 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 9r + r = 80 + -1r + r Combine like terms: 9r + r = 10r 10r = 80 + -1r + r Combine like terms: -1r + r = 0 10r = 80 + 0 10r = 80 Divide each side by '10'. r = 8 Simplifying r = 8
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