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Simplifying -19 + -3a = -4(a + 3) Reorder the terms: -19 + -3a = -4(3 + a) -19 + -3a = (3 * -4 + a * -4) -19 + -3a = (-12 + -4a) Solving -19 + -3a = -12 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. -19 + -3a + 4a = -12 + -4a + 4a Combine like terms: -3a + 4a = 1a -19 + 1a = -12 + -4a + 4a Combine like terms: -4a + 4a = 0 -19 + 1a = -12 + 0 -19 + 1a = -12 Add '19' to each side of the equation. -19 + 19 + 1a = -12 + 19 Combine like terms: -19 + 19 = 0 0 + 1a = -12 + 19 1a = -12 + 19 Combine like terms: -12 + 19 = 7 1a = 7 Divide each side by '1'. a = 7 Simplifying a = 7
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