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Simplifying -90 = 6(2a + -1) Reorder the terms: -90 = 6(-1 + 2a) -90 = (-1 * 6 + 2a * 6) -90 = (-6 + 12a) Solving -90 = -6 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. -90 + -12a = -6 + 12a + -12a Combine like terms: 12a + -12a = 0 -90 + -12a = -6 + 0 -90 + -12a = -6 Add '90' to each side of the equation. -90 + 90 + -12a = -6 + 90 Combine like terms: -90 + 90 = 0 0 + -12a = -6 + 90 -12a = -6 + 90 Combine like terms: -6 + 90 = 84 -12a = 84 Divide each side by '-12'. a = -7 Simplifying a = -7
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