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Simplifying -8a + -4 + -7a = 18 Reorder the terms: -4 + -8a + -7a = 18 Combine like terms: -8a + -7a = -15a -4 + -15a = 18 Solving -4 + -15a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -15a = 18 + 4 Combine like terms: -4 + 4 = 0 0 + -15a = 18 + 4 -15a = 18 + 4 Combine like terms: 18 + 4 = 22 -15a = 22 Divide each side by '-15'. a = -1.466666667 Simplifying a = -1.466666667
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