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Simplifying 91 = -7(1 + 7r) 91 = (1 * -7 + 7r * -7) 91 = (-7 + -49r) Solving 91 = -7 + -49r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '49r' to each side of the equation. 91 + 49r = -7 + -49r + 49r Combine like terms: -49r + 49r = 0 91 + 49r = -7 + 0 91 + 49r = -7 Add '-91' to each side of the equation. 91 + -91 + 49r = -7 + -91 Combine like terms: 91 + -91 = 0 0 + 49r = -7 + -91 49r = -7 + -91 Combine like terms: -7 + -91 = -98 49r = -98 Divide each side by '49'. r = -2 Simplifying r = -2
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