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Simplifying x + 78 + x + a + 87 = 199 Reorder the terms: 78 + 87 + a + x + x = 199 Combine like terms: 78 + 87 = 165 165 + a + x + x = 199 Combine like terms: x + x = 2x 165 + a + 2x = 199 Solving 165 + a + 2x = 199 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-165' to each side of the equation. 165 + a + -165 + 2x = 199 + -165 Reorder the terms: 165 + -165 + a + 2x = 199 + -165 Combine like terms: 165 + -165 = 0 0 + a + 2x = 199 + -165 a + 2x = 199 + -165 Combine like terms: 199 + -165 = 34 a + 2x = 34 Add '-2x' to each side of the equation. a + 2x + -2x = 34 + -2x Combine like terms: 2x + -2x = 0 a + 0 = 34 + -2x a = 34 + -2x Simplifying a = 34 + -2x
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