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Simplifying 15a + -4 + 8a = 180 Reorder the terms: -4 + 15a + 8a = 180 Combine like terms: 15a + 8a = 23a -4 + 23a = 180 Solving -4 + 23a = 180 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 + 23a = 180 + 4 Combine like terms: -4 + 4 = 0 0 + 23a = 180 + 4 23a = 180 + 4 Combine like terms: 180 + 4 = 184 23a = 184 Divide each side by '23'. a = 8 Simplifying a = 8
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