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Simplifying 4[r + -80] = 76 Reorder the terms: 4[-80 + r] = 76 [-80 * 4 + r * 4] = 76 [-320 + 4r] = 76 Solving -320 + 4r = 76 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '320' to each side of the equation. -320 + 320 + 4r = 76 + 320 Combine like terms: -320 + 320 = 0 0 + 4r = 76 + 320 4r = 76 + 320 Combine like terms: 76 + 320 = 396 4r = 396 Divide each side by '4'. r = 99 Simplifying r = 99
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