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Simplifying -6a + -15 = 3(a + -7) Reorder the terms: -15 + -6a = 3(a + -7) Reorder the terms: -15 + -6a = 3(-7 + a) -15 + -6a = (-7 * 3 + a * 3) -15 + -6a = (-21 + 3a) Solving -15 + -6a = -21 + 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 + -6a + -3a = -21 + 3a + -3a Combine like terms: -6a + -3a = -9a -15 + -9a = -21 + 3a + -3a Combine like terms: 3a + -3a = 0 -15 + -9a = -21 + 0 -15 + -9a = -21 Add '15' to each side of the equation. -15 + 15 + -9a = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -9a = -21 + 15 -9a = -21 + 15 Combine like terms: -21 + 15 = -6 -9a = -6 Divide each side by '-9'. a = 0.6666666667 Simplifying a = 0.6666666667
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