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Simplifying 19a + -12 + -4a = 57 Reorder the terms: -12 + 19a + -4a = 57 Combine like terms: 19a + -4a = 15a -12 + 15a = 57 Solving -12 + 15a = 57 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 15a = 57 + 12 Combine like terms: -12 + 12 = 0 0 + 15a = 57 + 12 15a = 57 + 12 Combine like terms: 57 + 12 = 69 15a = 69 Divide each side by '15'. a = 4.6 Simplifying a = 4.6
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