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Simplifying -63 = -3(7 + 7a) -63 = (7 * -3 + 7a * -3) -63 = (-21 + -21a) Solving -63 = -21 + -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. -63 + 21a = -21 + -21a + 21a Combine like terms: -21a + 21a = 0 -63 + 21a = -21 + 0 -63 + 21a = -21 Add '63' to each side of the equation. -63 + 63 + 21a = -21 + 63 Combine like terms: -63 + 63 = 0 0 + 21a = -21 + 63 21a = -21 + 63 Combine like terms: -21 + 63 = 42 21a = 42 Divide each side by '21'. a = 2 Simplifying a = 2
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