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Simplifying 8a + 4a + -7 = 4 + -1a Reorder the terms: -7 + 8a + 4a = 4 + -1a Combine like terms: 8a + 4a = 12a -7 + 12a = 4 + -1a Solving -7 + 12a = 4 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. -7 + 12a + a = 4 + -1a + a Combine like terms: 12a + a = 13a -7 + 13a = 4 + -1a + a Combine like terms: -1a + a = 0 -7 + 13a = 4 + 0 -7 + 13a = 4 Add '7' to each side of the equation. -7 + 7 + 13a = 4 + 7 Combine like terms: -7 + 7 = 0 0 + 13a = 4 + 7 13a = 4 + 7 Combine like terms: 4 + 7 = 11 13a = 11 Divide each side by '13'. a = 0.8461538462 Simplifying a = 0.8461538462
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