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Simplifying 7a + -9 = 7x + 12 Reorder the terms: -9 + 7a = 7x + 12 Reorder the terms: -9 + 7a = 12 + 7x Solving -9 + 7a = 12 + 7x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 7a = 12 + 9 + 7x Combine like terms: -9 + 9 = 0 0 + 7a = 12 + 9 + 7x 7a = 12 + 9 + 7x Combine like terms: 12 + 9 = 21 7a = 21 + 7x Divide each side by '7'. a = 3 + x Simplifying a = 3 + x
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