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Simplifying -7a + -15 = 2(a + -3) Reorder the terms: -15 + -7a = 2(a + -3) Reorder the terms: -15 + -7a = 2(-3 + a) -15 + -7a = (-3 * 2 + a * 2) -15 + -7a = (-6 + 2a) Solving -15 + -7a = -6 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. -15 + -7a + -2a = -6 + 2a + -2a Combine like terms: -7a + -2a = -9a -15 + -9a = -6 + 2a + -2a Combine like terms: 2a + -2a = 0 -15 + -9a = -6 + 0 -15 + -9a = -6 Add '15' to each side of the equation. -15 + 15 + -9a = -6 + 15 Combine like terms: -15 + 15 = 0 0 + -9a = -6 + 15 -9a = -6 + 15 Combine like terms: -6 + 15 = 9 -9a = 9 Divide each side by '-9'. a = -1 Simplifying a = -1
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