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Simplifying 91 = -7a Solving 91 = -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 91 + 7a = -7a + 7a Combine like terms: -7a + 7a = 0 91 + 7a = 0 Add '-91' to each side of the equation. 91 + -91 + 7a = 0 + -91 Combine like terms: 91 + -91 = 0 0 + 7a = 0 + -91 7a = 0 + -91 Combine like terms: 0 + -91 = -91 7a = -91 Divide each side by '7'. a = -13 Simplifying a = -13
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