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Simplifying 77 = 7(3a + -1) Reorder the terms: 77 = 7(-1 + 3a) 77 = (-1 * 7 + 3a * 7) 77 = (-7 + 21a) Solving 77 = -7 + 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. 77 + -21a = -7 + 21a + -21a Combine like terms: 21a + -21a = 0 77 + -21a = -7 + 0 77 + -21a = -7 Add '-77' to each side of the equation. 77 + -77 + -21a = -7 + -77 Combine like terms: 77 + -77 = 0 0 + -21a = -7 + -77 -21a = -7 + -77 Combine like terms: -7 + -77 = -84 -21a = -84 Divide each side by '-21'. a = 4 Simplifying a = 4
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