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Simplifying -7 = 7(a + -3) Reorder the terms: -7 = 7(-3 + a) -7 = (-3 * 7 + a * 7) -7 = (-21 + 7a) Solving -7 = -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. -7 + -7a = -21 + 7a + -7a Combine like terms: 7a + -7a = 0 -7 + -7a = -21 + 0 -7 + -7a = -21 Add '7' to each side of the equation. -7 + 7 + -7a = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -7a = -21 + 7 -7a = -21 + 7 Combine like terms: -21 + 7 = -14 -7a = -14 Divide each side by '-7'. a = 2 Simplifying a = 2
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