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Simplifying 5a + 4 + 8a + -5 = 90 Reorder the terms: 4 + -5 + 5a + 8a = 90 Combine like terms: 4 + -5 = -1 -1 + 5a + 8a = 90 Combine like terms: 5a + 8a = 13a -1 + 13a = 90 Solving -1 + 13a = 90 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 + 13a = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 13a = 90 + 1 13a = 90 + 1 Combine like terms: 90 + 1 = 91 13a = 91 Divide each side by '13'. a = 7 Simplifying a = 7
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