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Simplifying -3(1 + 6r) + r = -156 (1 * -3 + 6r * -3) + r = -156 (-3 + -18r) + r = -156 Combine like terms: -18r + r = -17r -3 + -17r = -156 Solving -3 + -17r = -156 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -17r = -156 + 3 Combine like terms: -3 + 3 = 0 0 + -17r = -156 + 3 -17r = -156 + 3 Combine like terms: -156 + 3 = -153 -17r = -153 Divide each side by '-17'. r = 9 Simplifying r = 9
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