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Simplifying 42 = 4a + 9 Reorder the terms: 42 = 9 + 4a Solving 42 = 9 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 42 + -4a = 9 + 4a + -4a Combine like terms: 4a + -4a = 0 42 + -4a = 9 + 0 42 + -4a = 9 Add '-42' to each side of the equation. 42 + -42 + -4a = 9 + -42 Combine like terms: 42 + -42 = 0 0 + -4a = 9 + -42 -4a = 9 + -42 Combine like terms: 9 + -42 = -33 -4a = -33 Divide each side by '-4'. a = 8.25 Simplifying a = 8.25
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