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Simplifying 7a + 4(a + 3) = 133 Reorder the terms: 7a + 4(3 + a) = 133 7a + (3 * 4 + a * 4) = 133 7a + (12 + 4a) = 133 Reorder the terms: 12 + 7a + 4a = 133 Combine like terms: 7a + 4a = 11a 12 + 11a = 133 Solving 12 + 11a = 133 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 + 11a = 133 + -12 Combine like terms: 12 + -12 = 0 0 + 11a = 133 + -12 11a = 133 + -12 Combine like terms: 133 + -12 = 121 11a = 121 Divide each side by '11'. a = 11 Simplifying a = 11
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