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Simplifying -15 = 7a + -4 + -4a Reorder the terms: -15 = -4 + 7a + -4a Combine like terms: 7a + -4a = 3a -15 = -4 + 3a Solving -15 = -4 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. -15 + -3a = -4 + 3a + -3a Combine like terms: 3a + -3a = 0 -15 + -3a = -4 + 0 -15 + -3a = -4 Add '15' to each side of the equation. -15 + 15 + -3a = -4 + 15 Combine like terms: -15 + 15 = 0 0 + -3a = -4 + 15 -3a = -4 + 15 Combine like terms: -4 + 15 = 11 -3a = 11 Divide each side by '-3'. a = -3.666666667 Simplifying a = -3.666666667
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