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Simplifying 2a + -21 = -7(3 + 7a) Reorder the terms: -21 + 2a = -7(3 + 7a) -21 + 2a = (3 * -7 + 7a * -7) -21 + 2a = (-21 + -49a) Add '21' to each side of the equation. -21 + 21 + 2a = -21 + 21 + -49a Combine like terms: -21 + 21 = 0 0 + 2a = -21 + 21 + -49a 2a = -21 + 21 + -49a Combine like terms: -21 + 21 = 0 2a = 0 + -49a 2a = -49a Solving 2a = -49a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '49a' to each side of the equation. 2a + 49a = -49a + 49a Combine like terms: 2a + 49a = 51a 51a = -49a + 49a Combine like terms: -49a + 49a = 0 51a = 0 Divide each side by '51'. a = 0 Simplifying a = 0
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