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Simplifying 2a + -2(1 + 6a) = -86 2a + (1 * -2 + 6a * -2) = -86 2a + (-2 + -12a) = -86 Reorder the terms: -2 + 2a + -12a = -86 Combine like terms: 2a + -12a = -10a -2 + -10a = -86 Solving -2 + -10a = -86 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -10a = -86 + 2 Combine like terms: -2 + 2 = 0 0 + -10a = -86 + 2 -10a = -86 + 2 Combine like terms: -86 + 2 = -84 -10a = -84 Divide each side by '-10'. a = 8.4 Simplifying a = 8.4
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