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Simplifying 90 = 5(4 + 2a) 90 = (4 * 5 + 2a * 5) 90 = (20 + 10a) Solving 90 = 20 + 10a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10a' to each side of the equation. 90 + -10a = 20 + 10a + -10a Combine like terms: 10a + -10a = 0 90 + -10a = 20 + 0 90 + -10a = 20 Add '-90' to each side of the equation. 90 + -90 + -10a = 20 + -90 Combine like terms: 90 + -90 = 0 0 + -10a = 20 + -90 -10a = 20 + -90 Combine like terms: 20 + -90 = -70 -10a = -70 Divide each side by '-10'. a = 7 Simplifying a = 7
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