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Simplifying 3a + 4(a + 12) = 90 Reorder the terms: 3a + 4(12 + a) = 90 3a + (12 * 4 + a * 4) = 90 3a + (48 + 4a) = 90 Reorder the terms: 48 + 3a + 4a = 90 Combine like terms: 3a + 4a = 7a 48 + 7a = 90 Solving 48 + 7a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-48' to each side of the equation. 48 + -48 + 7a = 90 + -48 Combine like terms: 48 + -48 = 0 0 + 7a = 90 + -48 7a = 90 + -48 Combine like terms: 90 + -48 = 42 7a = 42 Divide each side by '7'. a = 6 Simplifying a = 6
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