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Simplifying 91 = 7(-4 + r) 91 = (-4 * 7 + r * 7) 91 = (-28 + 7r) Solving 91 = -28 + 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 = -28 + 7r + -7r Combine like terms: 7r + -7r = 0 91 + -7r = -28 + 0 91 + -7r = -28 Add '-91' to each side of the equation. 91 + -91 + -7r = -28 + -91 Combine like terms: 91 + -91 = 0 0 + -7r = -28 + -91 -7r = -28 + -91 Combine like terms: -28 + -91 = -119 -7r = -119 Divide each side by '-7'. r = 17 Simplifying r = 17
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