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Simplifying -156 = -4(7a + 4) Reorder the terms: -156 = -4(4 + 7a) -156 = (4 * -4 + 7a * -4) -156 = (-16 + -28a) Solving -156 = -16 + -28a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28a' to each side of the equation. -156 + 28a = -16 + -28a + 28a Combine like terms: -28a + 28a = 0 -156 + 28a = -16 + 0 -156 + 28a = -16 Add '156' to each side of the equation. -156 + 156 + 28a = -16 + 156 Combine like terms: -156 + 156 = 0 0 + 28a = -16 + 156 28a = -16 + 156 Combine like terms: -16 + 156 = 140 28a = 140 Divide each side by '28'. a = 5 Simplifying a = 5
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