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Simplifying -3(-2 + a) + -4a + 15 = -7 (-2 * -3 + a * -3) + -4a + 15 = -7 (6 + -3a) + -4a + 15 = -7 Reorder the terms: 6 + 15 + -3a + -4a = -7 Combine like terms: 6 + 15 = 21 21 + -3a + -4a = -7 Combine like terms: -3a + -4a = -7a 21 + -7a = -7 Solving 21 + -7a = -7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -7a = -7 + -21 Combine like terms: 21 + -21 = 0 0 + -7a = -7 + -21 -7a = -7 + -21 Combine like terms: -7 + -21 = -28 -7a = -28 Divide each side by '-7'. a = 4 Simplifying a = 4
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