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Simplifying -91 = 7(r + -7) Reorder the terms: -91 = 7(-7 + r) -91 = (-7 * 7 + r * 7) -91 = (-49 + 7r) Solving -91 = -49 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -91 + -7r = -49 + 7r + -7r Combine like terms: 7r + -7r = 0 -91 + -7r = -49 + 0 -91 + -7r = -49 Add '91' to each side of the equation. -91 + 91 + -7r = -49 + 91 Combine like terms: -91 + 91 = 0 0 + -7r = -49 + 91 -7r = -49 + 91 Combine like terms: -49 + 91 = 42 -7r = 42 Divide each side by '-7'. r = -6 Simplifying r = -6
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