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Simplifying 9 + 4x + 4 + 7a = 90 Reorder the terms: 9 + 4 + 7a + 4x = 90 Combine like terms: 9 + 4 = 13 13 + 7a + 4x = 90 Solving 13 + 7a + 4x = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + 7a + -13 + 4x = 90 + -13 Reorder the terms: 13 + -13 + 7a + 4x = 90 + -13 Combine like terms: 13 + -13 = 0 0 + 7a + 4x = 90 + -13 7a + 4x = 90 + -13 Combine like terms: 90 + -13 = 77 7a + 4x = 77 Add '-4x' to each side of the equation. 7a + 4x + -4x = 77 + -4x Combine like terms: 4x + -4x = 0 7a + 0 = 77 + -4x 7a = 77 + -4x Divide each side by '7'. a = 11 + -0.5714285714x Simplifying a = 11 + -0.5714285714x
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