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Simplifying 3a + -2(a + -3(a + -3)) + -4 = -1 Reorder the terms: 3a + -2(a + -3(-3 + a)) + -4 = -1 3a + -2(a + (-3 * -3 + a * -3)) + -4 = -1 3a + -2(a + (9 + -3a)) + -4 = -1 Reorder the terms: 3a + -2(9 + a + -3a) + -4 = -1 Combine like terms: a + -3a = -2a 3a + -2(9 + -2a) + -4 = -1 3a + (9 * -2 + -2a * -2) + -4 = -1 3a + (-18 + 4a) + -4 = -1 Reorder the terms: -18 + -4 + 3a + 4a = -1 Combine like terms: -18 + -4 = -22 -22 + 3a + 4a = -1 Combine like terms: 3a + 4a = 7a -22 + 7a = -1 Solving -22 + 7a = -1 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '22' to each side of the equation. -22 + 22 + 7a = -1 + 22 Combine like terms: -22 + 22 = 0 0 + 7a = -1 + 22 7a = -1 + 22 Combine like terms: -1 + 22 = 21 7a = 21 Divide each side by '7'. a = 3 Simplifying a = 3
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