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Simplifying 4.5 + 1.5a = 18 + -3a Solving 4.5 + 1.5a = 18 + -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. 4.5 + 1.5a + 3a = 18 + -3a + 3a Combine like terms: 1.5a + 3a = 4.5a 4.5 + 4.5a = 18 + -3a + 3a Combine like terms: -3a + 3a = 0 4.5 + 4.5a = 18 + 0 4.5 + 4.5a = 18 Add '-4.5' to each side of the equation. 4.5 + -4.5 + 4.5a = 18 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + 4.5a = 18 + -4.5 4.5a = 18 + -4.5 Combine like terms: 18 + -4.5 = 13.5 4.5a = 13.5 Divide each side by '4.5'. a = 3 Simplifying a = 3
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