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Simplifying 7 = (5 + a) * 4 Reorder the terms for easier multiplication: 7 = 4(5 + a) 7 = (5 * 4 + a * 4) 7 = (20 + 4a) Solving 7 = 20 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 7 + -4a = 20 + 4a + -4a Combine like terms: 4a + -4a = 0 7 + -4a = 20 + 0 7 + -4a = 20 Add '-7' to each side of the equation. 7 + -7 + -4a = 20 + -7 Combine like terms: 7 + -7 = 0 0 + -4a = 20 + -7 -4a = 20 + -7 Combine like terms: 20 + -7 = 13 -4a = 13 Divide each side by '-4'. a = -3.25 Simplifying a = -3.25
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