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Simplifying a + 84 = 3a Reorder the terms: 84 + a = 3a Solving 84 + a = 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 84 + a + -3a = 3a + -3a Combine like terms: a + -3a = -2a 84 + -2a = 3a + -3a Combine like terms: 3a + -3a = 0 84 + -2a = 0 Add '-84' to each side of the equation. 84 + -84 + -2a = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -2a = 0 + -84 -2a = 0 + -84 Combine like terms: 0 + -84 = -84 -2a = -84 Divide each side by '-2'. a = 42 Simplifying a = 42
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