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Simplifying -15a + -1 = 89 Reorder the terms: -1 + -15a = 89 Solving -1 + -15a = 89 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -15a = 89 + 1 Combine like terms: -1 + 1 = 0 0 + -15a = 89 + 1 -15a = 89 + 1 Combine like terms: 89 + 1 = 90 -15a = 90 Divide each side by '-15'. a = -6 Simplifying a = -6
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