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Simplifying 4r + 2(1 + 6r) = 130 4r + (1 * 2 + 6r * 2) = 130 4r + (2 + 12r) = 130 Reorder the terms: 2 + 4r + 12r = 130 Combine like terms: 4r + 12r = 16r 2 + 16r = 130 Solving 2 + 16r = 130 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 16r = 130 + -2 Combine like terms: 2 + -2 = 0 0 + 16r = 130 + -2 16r = 130 + -2 Combine like terms: 130 + -2 = 128 16r = 128 Divide each side by '16'. r = 8 Simplifying r = 8
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