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Simplifying -91 = -7(3r + 4) Reorder the terms: -91 = -7(4 + 3r) -91 = (4 * -7 + 3r * -7) -91 = (-28 + -21r) Solving -91 = -28 + -21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21r' to each side of the equation. -91 + 21r = -28 + -21r + 21r Combine like terms: -21r + 21r = 0 -91 + 21r = -28 + 0 -91 + 21r = -28 Add '91' to each side of the equation. -91 + 91 + 21r = -28 + 91 Combine like terms: -91 + 91 = 0 0 + 21r = -28 + 91 21r = -28 + 91 Combine like terms: -28 + 91 = 63 21r = 63 Divide each side by '21'. r = 3 Simplifying r = 3
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