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Simplifying -4 + -3(a + 1) = 9 + a Reorder the terms: -4 + -3(1 + a) = 9 + a -4 + (1 * -3 + a * -3) = 9 + a -4 + (-3 + -3a) = 9 + a Combine like terms: -4 + -3 = -7 -7 + -3a = 9 + a Solving -7 + -3a = 9 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -7 + -3a + -1a = 9 + a + -1a Combine like terms: -3a + -1a = -4a -7 + -4a = 9 + a + -1a Combine like terms: a + -1a = 0 -7 + -4a = 9 + 0 -7 + -4a = 9 Add '7' to each side of the equation. -7 + 7 + -4a = 9 + 7 Combine like terms: -7 + 7 = 0 0 + -4a = 9 + 7 -4a = 9 + 7 Combine like terms: 9 + 7 = 16 -4a = 16 Divide each side by '-4'. a = -4 Simplifying a = -4
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