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Simplifying 4 + -3(3 + 7a) = -131 4 + (3 * -3 + 7a * -3) = -131 4 + (-9 + -21a) = -131 Combine like terms: 4 + -9 = -5 -5 + -21a = -131 Solving -5 + -21a = -131 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -21a = -131 + 5 Combine like terms: -5 + 5 = 0 0 + -21a = -131 + 5 -21a = -131 + 5 Combine like terms: -131 + 5 = -126 -21a = -126 Divide each side by '-21'. a = 6 Simplifying a = 6
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