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Simplifying -139 = -7 + -3(-4 + 6a) -139 = -7 + (-4 * -3 + 6a * -3) -139 = -7 + (12 + -18a) Combine like terms: -7 + 12 = 5 -139 = 5 + -18a Solving -139 = 5 + -18a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '18a' to each side of the equation. -139 + 18a = 5 + -18a + 18a Combine like terms: -18a + 18a = 0 -139 + 18a = 5 + 0 -139 + 18a = 5 Add '139' to each side of the equation. -139 + 139 + 18a = 5 + 139 Combine like terms: -139 + 139 = 0 0 + 18a = 5 + 139 18a = 5 + 139 Combine like terms: 5 + 139 = 144 18a = 144 Divide each side by '18'. a = 8 Simplifying a = 8
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