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Simplifying -4(1 + 3a) + -3 = -39 + -89 (1 * -4 + 3a * -4) + -3 = -39 + -89 (-4 + -12a) + -3 = -39 + -89 Reorder the terms: -4 + -3 + -12a = -39 + -89 Combine like terms: -4 + -3 = -7 -7 + -12a = -39 + -89 Combine like terms: -39 + -89 = -128 -7 + -12a = -128 Solving -7 + -12a = -128 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -12a = -128 + 7 Combine like terms: -7 + 7 = 0 0 + -12a = -128 + 7 -12a = -128 + 7 Combine like terms: -128 + 7 = -121 -12a = -121 Divide each side by '-12'. a = 10.08333333 Simplifying a = 10.08333333
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