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Simplifying 3(-7) + a = 9 Multiply 3 * -7 -21 + a = 9 Solving -21 + a = 9 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 + a = 9 + 21 Combine like terms: -21 + 21 = 0 0 + a = 9 + 21 a = 9 + 21 Combine like terms: 9 + 21 = 30 a = 30 Simplifying a = 30
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