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Simplifying -63 = -7(-1a + 1) Reorder the terms: -63 = -7(1 + -1a) -63 = (1 * -7 + -1a * -7) -63 = (-7 + 7a) Solving -63 = -7 + 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. -63 + -7a = -7 + 7a + -7a Combine like terms: 7a + -7a = 0 -63 + -7a = -7 + 0 -63 + -7a = -7 Add '63' to each side of the equation. -63 + 63 + -7a = -7 + 63 Combine like terms: -63 + 63 = 0 0 + -7a = -7 + 63 -7a = -7 + 63 Combine like terms: -7 + 63 = 56 -7a = 56 Divide each side by '-7'. a = -8 Simplifying a = -8
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