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Simplifying 3a + 7(a + -1) = 19 Reorder the terms: 3a + 7(-1 + a) = 19 3a + (-1 * 7 + a * 7) = 19 3a + (-7 + 7a) = 19 Reorder the terms: -7 + 3a + 7a = 19 Combine like terms: 3a + 7a = 10a -7 + 10a = 19 Solving -7 + 10a = 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 + 10a = 19 + 7 Combine like terms: -7 + 7 = 0 0 + 10a = 19 + 7 10a = 19 + 7 Combine like terms: 19 + 7 = 26 10a = 26 Divide each side by '10'. a = 2.6 Simplifying a = 2.6
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