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Simplifying 9r = 4(r + -10) Reorder the terms: 9r = 4(-10 + r) 9r = (-10 * 4 + r * 4) 9r = (-40 + 4r) Solving 9r = -40 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 9r + -4r = -40 + 4r + -4r Combine like terms: 9r + -4r = 5r 5r = -40 + 4r + -4r Combine like terms: 4r + -4r = 0 5r = -40 + 0 5r = -40 Divide each side by '5'. r = -8 Simplifying r = -8
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