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Simplifying 3(7a + -7) + -7a = -91 Reorder the terms: 3(-7 + 7a) + -7a = -91 (-7 * 3 + 7a * 3) + -7a = -91 (-21 + 21a) + -7a = -91 Combine like terms: 21a + -7a = 14a -21 + 14a = -91 Solving -21 + 14a = -91 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 14a = -91 + 21 Combine like terms: -21 + 21 = 0 0 + 14a = -91 + 21 14a = -91 + 21 Combine like terms: -91 + 21 = -70 14a = -70 Divide each side by '14'. a = -5 Simplifying a = -5
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