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Simplifying 3a + -1(7 + -2a) = 42 3a + (7 * -1 + -2a * -1) = 42 3a + (-7 + 2a) = 42 Reorder the terms: -7 + 3a + 2a = 42 Combine like terms: 3a + 2a = 5a -7 + 5a = 42 Solving -7 + 5a = 42 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 + 5a = 42 + 7 Combine like terms: -7 + 7 = 0 0 + 5a = 42 + 7 5a = 42 + 7 Combine like terms: 42 + 7 = 49 5a = 49 Divide each side by '5'. a = 9.8 Simplifying a = 9.8
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