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Simplifying -7 + -7a = -1(3a + 3) Reorder the terms: -7 + -7a = -1(3 + 3a) -7 + -7a = (3 * -1 + 3a * -1) -7 + -7a = (-3 + -3a) Solving -7 + -7a = -3 + -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. -7 + -7a + 3a = -3 + -3a + 3a Combine like terms: -7a + 3a = -4a -7 + -4a = -3 + -3a + 3a Combine like terms: -3a + 3a = 0 -7 + -4a = -3 + 0 -7 + -4a = -3 Add '7' to each side of the equation. -7 + 7 + -4a = -3 + 7 Combine like terms: -7 + 7 = 0 0 + -4a = -3 + 7 -4a = -3 + 7 Combine like terms: -3 + 7 = 4 -4a = 4 Divide each side by '-4'. a = -1 Simplifying a = -1
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