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Simplifying 7(a + 1) + -2a = 5 + 4(a + -1) Reorder the terms: 7(1 + a) + -2a = 5 + 4(a + -1) (1 * 7 + a * 7) + -2a = 5 + 4(a + -1) (7 + 7a) + -2a = 5 + 4(a + -1) Combine like terms: 7a + -2a = 5a 7 + 5a = 5 + 4(a + -1) Reorder the terms: 7 + 5a = 5 + 4(-1 + a) 7 + 5a = 5 + (-1 * 4 + a * 4) 7 + 5a = 5 + (-4 + 4a) Combine like terms: 5 + -4 = 1 7 + 5a = 1 + 4a Solving 7 + 5a = 1 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 7 + 5a + -4a = 1 + 4a + -4a Combine like terms: 5a + -4a = 1a 7 + 1a = 1 + 4a + -4a Combine like terms: 4a + -4a = 0 7 + 1a = 1 + 0 7 + 1a = 1 Add '-7' to each side of the equation. 7 + -7 + 1a = 1 + -7 Combine like terms: 7 + -7 = 0 0 + 1a = 1 + -7 1a = 1 + -7 Combine like terms: 1 + -7 = -6 1a = -6 Divide each side by '1'. a = -6 Simplifying a = -6
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