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