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Simplifying 5a + -1(2a + -1) = 21 Reorder the terms: 5a + -1(-1 + 2a) = 21 5a + (-1 * -1 + 2a * -1) = 21 5a + (1 + -2a) = 21 Reorder the terms: 1 + 5a + -2a = 21 Combine like terms: 5a + -2a = 3a 1 + 3a = 21 Solving 1 + 3a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3a = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 3a = 21 + -1 3a = 21 + -1 Combine like terms: 21 + -1 = 20 3a = 20 Divide each side by '3'. a = 6.666666667 Simplifying a = 6.666666667
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