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Simplifying 70 = -2(1 + 6r) 70 = (1 * -2 + 6r * -2) 70 = (-2 + -12r) Solving 70 = -2 + -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. 70 + 12r = -2 + -12r + 12r Combine like terms: -12r + 12r = 0 70 + 12r = -2 + 0 70 + 12r = -2 Add '-70' to each side of the equation. 70 + -70 + 12r = -2 + -70 Combine like terms: 70 + -70 = 0 0 + 12r = -2 + -70 12r = -2 + -70 Combine like terms: -2 + -70 = -72 12r = -72 Divide each side by '12'. r = -6 Simplifying r = -6
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