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Simplifying 3a + (a + 12) = 90 Reorder the terms: 3a + (12 + a) = 90 Remove parenthesis around (12 + a) 3a + 12 + a = 90 Reorder the terms: 12 + 3a + a = 90 Combine like terms: 3a + a = 4a 12 + 4a = 90 Solving 12 + 4a = 90 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 + 4a = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 4a = 90 + -12 4a = 90 + -12 Combine like terms: 90 + -12 = 78 4a = 78 Divide each side by '4'. a = 19.5 Simplifying a = 19.5
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