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Simplifying -2a + -9 = 6a * 15 Reorder the terms: -9 + -2a = 6a * 15 Reorder the terms for easier multiplication: -9 + -2a = 6 * 15a Multiply 6 * 15 -9 + -2a = 90a Solving -9 + -2a = 90a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-90a' to each side of the equation. -9 + -2a + -90a = 90a + -90a Combine like terms: -2a + -90a = -92a -9 + -92a = 90a + -90a Combine like terms: 90a + -90a = 0 -9 + -92a = 0 Add '9' to each side of the equation. -9 + 9 + -92a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -92a = 0 + 9 -92a = 0 + 9 Combine like terms: 0 + 9 = 9 -92a = 9 Divide each side by '-92'. a = -0.09782608696 Simplifying a = -0.09782608696
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