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Simplifying 112 = -7(a + 3) Reorder the terms: 112 = -7(3 + a) 112 = (3 * -7 + a * -7) 112 = (-21 + -7a) Solving 112 = -21 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 112 + 7a = -21 + -7a + 7a Combine like terms: -7a + 7a = 0 112 + 7a = -21 + 0 112 + 7a = -21 Add '-112' to each side of the equation. 112 + -112 + 7a = -21 + -112 Combine like terms: 112 + -112 = 0 0 + 7a = -21 + -112 7a = -21 + -112 Combine like terms: -21 + -112 = -133 7a = -133 Divide each side by '7'. a = -19 Simplifying a = -19
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