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Simplifying 7a + -1(3a + -7) = 19 Reorder the terms: 7a + -1(-7 + 3a) = 19 7a + (-7 * -1 + 3a * -1) = 19 7a + (7 + -3a) = 19 Reorder the terms: 7 + 7a + -3a = 19 Combine like terms: 7a + -3a = 4a 7 + 4a = 19 Solving 7 + 4a = 19 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 + 4a = 19 + -7 Combine like terms: 7 + -7 = 0 0 + 4a = 19 + -7 4a = 19 + -7 Combine like terms: 19 + -7 = 12 4a = 12 Divide each side by '4'. a = 3 Simplifying a = 3
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