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Simplifying a + -3(a + -2) + 1 = 28 Reorder the terms: a + -3(-2 + a) + 1 = 28 a + (-2 * -3 + a * -3) + 1 = 28 a + (6 + -3a) + 1 = 28 Reorder the terms: 6 + 1 + a + -3a = 28 Combine like terms: 6 + 1 = 7 7 + a + -3a = 28 Combine like terms: a + -3a = -2a 7 + -2a = 28 Solving 7 + -2a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2a = 28 + -7 Combine like terms: 7 + -7 = 0 0 + -2a = 28 + -7 -2a = 28 + -7 Combine like terms: 28 + -7 = 21 -2a = 21 Divide each side by '-2'. a = -10.5 Simplifying a = -10.5
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