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Simplifying -1r + 4(1 + 3r) = 70 -1r + (1 * 4 + 3r * 4) = 70 -1r + (4 + 12r) = 70 Reorder the terms: 4 + -1r + 12r = 70 Combine like terms: -1r + 12r = 11r 4 + 11r = 70 Solving 4 + 11r = 70 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 11r = 70 + -4 Combine like terms: 4 + -4 = 0 0 + 11r = 70 + -4 11r = 70 + -4 Combine like terms: 70 + -4 = 66 11r = 66 Divide each side by '11'. r = 6 Simplifying r = 6
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