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Simplifying -3(4r + 1) + 1 = -86 Reorder the terms: -3(1 + 4r) + 1 = -86 (1 * -3 + 4r * -3) + 1 = -86 (-3 + -12r) + 1 = -86 Reorder the terms: -3 + 1 + -12r = -86 Combine like terms: -3 + 1 = -2 -2 + -12r = -86 Solving -2 + -12r = -86 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 + -12r = -86 + 2 Combine like terms: -2 + 2 = 0 0 + -12r = -86 + 2 -12r = -86 + 2 Combine like terms: -86 + 2 = -84 -12r = -84 Divide each side by '-12'. r = 7 Simplifying r = 7
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