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Simplifying -21 = -7(3 + 6a) -21 = (3 * -7 + 6a * -7) -21 = (-21 + -42a) Add '21' to each side of the equation. -21 + 21 = -21 + 21 + -42a Combine like terms: -21 + 21 = 0 0 = -21 + 21 + -42a Combine like terms: -21 + 21 = 0 0 = 0 + -42a 0 = -42a Solving 0 = -42a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '42a' to each side of the equation. 0 + 42a = -42a + 42a Remove the zero: 42a = -42a + 42a Combine like terms: -42a + 42a = 0 42a = 0 Divide each side by '42'. a = 0 Simplifying a = 0
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