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Simplifying x + 7 + 9a = (x + 7) Reorder the terms: 7 + 9a + x = (x + 7) Reorder the terms: 7 + 9a + x = (7 + x) Remove parenthesis around (7 + x) 7 + 9a + x = 7 + x Add '-7' to each side of the equation. 7 + 9a + -7 + x = 7 + -7 + x Reorder the terms: 7 + -7 + 9a + x = 7 + -7 + x Combine like terms: 7 + -7 = 0 0 + 9a + x = 7 + -7 + x 9a + x = 7 + -7 + x Combine like terms: 7 + -7 = 0 9a + x = 0 + x 9a + x = x Add '-1x' to each side of the equation. 9a + x + -1x = x + -1x Combine like terms: x + -1x = 0 9a + 0 = x + -1x 9a = x + -1x Combine like terms: x + -1x = 0 9a = 0 Solving 9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '9'. a = 0 Simplifying a = 0
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