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Simplifying 7a + 3(7a + -8) = -164 Reorder the terms: 7a + 3(-8 + 7a) = -164 7a + (-8 * 3 + 7a * 3) = -164 7a + (-24 + 21a) = -164 Reorder the terms: -24 + 7a + 21a = -164 Combine like terms: 7a + 21a = 28a -24 + 28a = -164 Solving -24 + 28a = -164 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '24' to each side of the equation. -24 + 24 + 28a = -164 + 24 Combine like terms: -24 + 24 = 0 0 + 28a = -164 + 24 28a = -164 + 24 Combine like terms: -164 + 24 = -140 28a = -140 Divide each side by '28'. a = -5 Simplifying a = -5
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