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Simplifying 2a + -1(7 + -5a) = 21 2a + (7 * -1 + -5a * -1) = 21 2a + (-7 + 5a) = 21 Reorder the terms: -7 + 2a + 5a = 21 Combine like terms: 2a + 5a = 7a -7 + 7a = 21 Solving -7 + 7a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 7a = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7a = 21 + 7 7a = 21 + 7 Combine like terms: 21 + 7 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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