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Simplifying 90 = 4a + a Combine like terms: 4a + a = 5a 90 = 5a Solving 90 = 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. 90 + -5a = 5a + -5a Combine like terms: 5a + -5a = 0 90 + -5a = 0 Add '-90' to each side of the equation. 90 + -90 + -5a = 0 + -90 Combine like terms: 90 + -90 = 0 0 + -5a = 0 + -90 -5a = 0 + -90 Combine like terms: 0 + -90 = -90 -5a = -90 Divide each side by '-5'. a = 18 Simplifying a = 18
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