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Simplifying -36 = 4(1 + 5a) -36 = (1 * 4 + 5a * 4) -36 = (4 + 20a) Solving -36 = 4 + 20a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20a' to each side of the equation. -36 + -20a = 4 + 20a + -20a Combine like terms: 20a + -20a = 0 -36 + -20a = 4 + 0 -36 + -20a = 4 Add '36' to each side of the equation. -36 + 36 + -20a = 4 + 36 Combine like terms: -36 + 36 = 0 0 + -20a = 4 + 36 -20a = 4 + 36 Combine like terms: 4 + 36 = 40 -20a = 40 Divide each side by '-20'. a = -2 Simplifying a = -2
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