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Simplifying 1 + -4(7a + -5) = -147 Reorder the terms: 1 + -4(-5 + 7a) = -147 1 + (-5 * -4 + 7a * -4) = -147 1 + (20 + -28a) = -147 Combine like terms: 1 + 20 = 21 21 + -28a = -147 Solving 21 + -28a = -147 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -28a = -147 + -21 Combine like terms: 21 + -21 = 0 0 + -28a = -147 + -21 -28a = -147 + -21 Combine like terms: -147 + -21 = -168 -28a = -168 Divide each side by '-28'. a = 6 Simplifying a = 6
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