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Simplifying 4a + 25.7 = 13(a + -1) Reorder the terms: 25.7 + 4a = 13(a + -1) Reorder the terms: 25.7 + 4a = 13(-1 + a) 25.7 + 4a = (-1 * 13 + a * 13) 25.7 + 4a = (-13 + 13a) Solving 25.7 + 4a = -13 + 13a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13a' to each side of the equation. 25.7 + 4a + -13a = -13 + 13a + -13a Combine like terms: 4a + -13a = -9a 25.7 + -9a = -13 + 13a + -13a Combine like terms: 13a + -13a = 0 25.7 + -9a = -13 + 0 25.7 + -9a = -13 Add '-25.7' to each side of the equation. 25.7 + -25.7 + -9a = -13 + -25.7 Combine like terms: 25.7 + -25.7 = 0.0 0.0 + -9a = -13 + -25.7 -9a = -13 + -25.7 Combine like terms: -13 + -25.7 = -38.7 -9a = -38.7 Divide each side by '-9'. a = 4.3 Simplifying a = 4.3
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