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Simplifying -81 = 3(1 + -7a) -81 = (1 * 3 + -7a * 3) -81 = (3 + -21a) Solving -81 = 3 + -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. -81 + 21a = 3 + -21a + 21a Combine like terms: -21a + 21a = 0 -81 + 21a = 3 + 0 -81 + 21a = 3 Add '81' to each side of the equation. -81 + 81 + 21a = 3 + 81 Combine like terms: -81 + 81 = 0 0 + 21a = 3 + 81 21a = 3 + 81 Combine like terms: 3 + 81 = 84 21a = 84 Divide each side by '21'. a = 4 Simplifying a = 4
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