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Simplifying -3a + 6(7a + -1) = 189 Reorder the terms: -3a + 6(-1 + 7a) = 189 -3a + (-1 * 6 + 7a * 6) = 189 -3a + (-6 + 42a) = 189 Reorder the terms: -6 + -3a + 42a = 189 Combine like terms: -3a + 42a = 39a -6 + 39a = 189 Solving -6 + 39a = 189 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 39a = 189 + 6 Combine like terms: -6 + 6 = 0 0 + 39a = 189 + 6 39a = 189 + 6 Combine like terms: 189 + 6 = 195 39a = 195 Divide each side by '39'. a = 5 Simplifying a = 5
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