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Simplifying 4(r + -130) + 4r = 3240 Reorder the terms: 4(-130 + r) + 4r = 3240 (-130 * 4 + r * 4) + 4r = 3240 (-520 + 4r) + 4r = 3240 Combine like terms: 4r + 4r = 8r -520 + 8r = 3240 Solving -520 + 8r = 3240 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '520' to each side of the equation. -520 + 520 + 8r = 3240 + 520 Combine like terms: -520 + 520 = 0 0 + 8r = 3240 + 520 8r = 3240 + 520 Combine like terms: 3240 + 520 = 3760 8r = 3760 Divide each side by '8'. r = 470 Simplifying r = 470
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