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Simplifying -5 + 7(1 + 3a) = 149 -5 + (1 * 7 + 3a * 7) = 149 -5 + (7 + 21a) = 149 Combine like terms: -5 + 7 = 2 2 + 21a = 149 Solving 2 + 21a = 149 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 21a = 149 + -2 Combine like terms: 2 + -2 = 0 0 + 21a = 149 + -2 21a = 149 + -2 Combine like terms: 149 + -2 = 147 21a = 147 Divide each side by '21'. a = 7 Simplifying a = 7
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