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Simplifying -156 = 3(-7r + 4) Reorder the terms: -156 = 3(4 + -7r) -156 = (4 * 3 + -7r * 3) -156 = (12 + -21r) Solving -156 = 12 + -21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21r' to each side of the equation. -156 + 21r = 12 + -21r + 21r Combine like terms: -21r + 21r = 0 -156 + 21r = 12 + 0 -156 + 21r = 12 Add '156' to each side of the equation. -156 + 156 + 21r = 12 + 156 Combine like terms: -156 + 156 = 0 0 + 21r = 12 + 156 21r = 12 + 156 Combine like terms: 12 + 156 = 168 21r = 168 Divide each side by '21'. r = 8 Simplifying r = 8
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