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Simplifying -13 + -8a + -4a = -5 Combine like terms: -8a + -4a = -12a -13 + -12a = -5 Solving -13 + -12a = -5 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + -12a = -5 + 13 Combine like terms: -13 + 13 = 0 0 + -12a = -5 + 13 -12a = -5 + 13 Combine like terms: -5 + 13 = 8 -12a = 8 Divide each side by '-12'. a = -0.6666666667 Simplifying a = -0.6666666667
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