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Simplifying 3a + -1(4a + 7) = 7 Reorder the terms: 3a + -1(7 + 4a) = 7 3a + (7 * -1 + 4a * -1) = 7 3a + (-7 + -4a) = 7 Reorder the terms: -7 + 3a + -4a = 7 Combine like terms: 3a + -4a = -1a -7 + -1a = 7 Solving -7 + -1a = 7 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 + -1a = 7 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = 7 + 7 -1a = 7 + 7 Combine like terms: 7 + 7 = 14 -1a = 14 Divide each side by '-1'. a = -14 Simplifying a = -14
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