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Simplifying (8a + -8) + (5a + -2) = 90 Reorder the terms: (-8 + 8a) + (5a + -2) = 90 Remove parenthesis around (-8 + 8a) -8 + 8a + (5a + -2) = 90 Reorder the terms: -8 + 8a + (-2 + 5a) = 90 Remove parenthesis around (-2 + 5a) -8 + 8a + -2 + 5a = 90 Reorder the terms: -8 + -2 + 8a + 5a = 90 Combine like terms: -8 + -2 = -10 -10 + 8a + 5a = 90 Combine like terms: 8a + 5a = 13a -10 + 13a = 90 Solving -10 + 13a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 13a = 90 + 10 Combine like terms: -10 + 10 = 0 0 + 13a = 90 + 10 13a = 90 + 10 Combine like terms: 90 + 10 = 100 13a = 100 Divide each side by '13'. a = 7.692307692 Simplifying a = 7.692307692
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