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Simplifying 21 = 5 + -1(2a + -1) Reorder the terms: 21 = 5 + -1(-1 + 2a) 21 = 5 + (-1 * -1 + 2a * -1) 21 = 5 + (1 + -2a) Combine like terms: 5 + 1 = 6 21 = 6 + -2a Solving 21 = 6 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 21 + 2a = 6 + -2a + 2a Combine like terms: -2a + 2a = 0 21 + 2a = 6 + 0 21 + 2a = 6 Add '-21' to each side of the equation. 21 + -21 + 2a = 6 + -21 Combine like terms: 21 + -21 = 0 0 + 2a = 6 + -21 2a = 6 + -21 Combine like terms: 6 + -21 = -15 2a = -15 Divide each side by '2'. a = -7.5 Simplifying a = -7.5
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