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Simplifying -1a + 3(7 + -6a) = -131 -1a + (7 * 3 + -6a * 3) = -131 -1a + (21 + -18a) = -131 Reorder the terms: 21 + -1a + -18a = -131 Combine like terms: -1a + -18a = -19a 21 + -19a = -131 Solving 21 + -19a = -131 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 + -19a = -131 + -21 Combine like terms: 21 + -21 = 0 0 + -19a = -131 + -21 -19a = -131 + -21 Combine like terms: -131 + -21 = -152 -19a = -152 Divide each side by '-19'. a = 8 Simplifying a = 8
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