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Simplifying 2a + 3(a + -7) = 0 Reorder the terms: 2a + 3(-7 + a) = 0 2a + (-7 * 3 + a * 3) = 0 2a + (-21 + 3a) = 0 Reorder the terms: -21 + 2a + 3a = 0 Combine like terms: 2a + 3a = 5a -21 + 5a = 0 Solving -21 + 5a = 0 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 + 5a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 5a = 0 + 21 5a = 0 + 21 Combine like terms: 0 + 21 = 21 5a = 21 Divide each side by '5'. a = 4.2 Simplifying a = 4.2
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