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Simplifying 3a + 9x = -7x + -2a Reorder the terms: 3a + 9x = -2a + -7x Solving 3a + 9x = -2a + -7x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 3a + 2a + 9x = -2a + 2a + -7x Combine like terms: 3a + 2a = 5a 5a + 9x = -2a + 2a + -7x Combine like terms: -2a + 2a = 0 5a + 9x = 0 + -7x 5a + 9x = -7x Add '-9x' to each side of the equation. 5a + 9x + -9x = -7x + -9x Combine like terms: 9x + -9x = 0 5a + 0 = -7x + -9x 5a = -7x + -9x Combine like terms: -7x + -9x = -16x 5a = -16x Divide each side by '5'. a = -3.2x Simplifying a = -3.2x
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