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Simplifying 585r = 130(5r + -20) Reorder the terms: 585r = 130(-20 + 5r) 585r = (-20 * 130 + 5r * 130) 585r = (-2600 + 650r) Solving 585r = -2600 + 650r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-650r' to each side of the equation. 585r + -650r = -2600 + 650r + -650r Combine like terms: 585r + -650r = -65r -65r = -2600 + 650r + -650r Combine like terms: 650r + -650r = 0 -65r = -2600 + 0 -65r = -2600 Divide each side by '-65'. r = 40 Simplifying r = 40
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