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Simplifying 8a + -30 + -25a = -129 Reorder the terms: -30 + 8a + -25a = -129 Combine like terms: 8a + -25a = -17a -30 + -17a = -129 Solving -30 + -17a = -129 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + -17a = -129 + 30 Combine like terms: -30 + 30 = 0 0 + -17a = -129 + 30 -17a = -129 + 30 Combine like terms: -129 + 30 = -99 -17a = -99 Divide each side by '-17'. a = 5.823529412 Simplifying a = 5.823529412
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