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Simplifying -84 = 3(4r + -4) Reorder the terms: -84 = 3(-4 + 4r) -84 = (-4 * 3 + 4r * 3) -84 = (-12 + 12r) Solving -84 = -12 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. -84 + -12r = -12 + 12r + -12r Combine like terms: 12r + -12r = 0 -84 + -12r = -12 + 0 -84 + -12r = -12 Add '84' to each side of the equation. -84 + 84 + -12r = -12 + 84 Combine like terms: -84 + 84 = 0 0 + -12r = -12 + 84 -12r = -12 + 84 Combine like terms: -12 + 84 = 72 -12r = 72 Divide each side by '-12'. r = -6 Simplifying r = -6
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