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Simplifying 7 + 2(2a + -3) + -17 = -15 Reorder the terms: 7 + 2(-3 + 2a) + -17 = -15 7 + (-3 * 2 + 2a * 2) + -17 = -15 7 + (-6 + 4a) + -17 = -15 Reorder the terms: 7 + -6 + -17 + 4a = -15 Combine like terms: 7 + -6 = 1 1 + -17 + 4a = -15 Combine like terms: 1 + -17 = -16 -16 + 4a = -15 Solving -16 + 4a = -15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + 4a = -15 + 16 Combine like terms: -16 + 16 = 0 0 + 4a = -15 + 16 4a = -15 + 16 Combine like terms: -15 + 16 = 1 4a = 1 Divide each side by '4'. a = 0.25 Simplifying a = 0.25
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