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Simplifying 77 = 7a + -7 Reorder the terms: 77 = -7 + 7a Solving 77 = -7 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 77 + -7a = -7 + 7a + -7a Combine like terms: 7a + -7a = 0 77 + -7a = -7 + 0 77 + -7a = -7 Add '-77' to each side of the equation. 77 + -77 + -7a = -7 + -77 Combine like terms: 77 + -77 = 0 0 + -7a = -7 + -77 -7a = -7 + -77 Combine like terms: -7 + -77 = -84 -7a = -84 Divide each side by '-7'. a = 12 Simplifying a = 12
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