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Simplifying -30 = 4(a + 3) Reorder the terms: -30 = 4(3 + a) -30 = (3 * 4 + a * 4) -30 = (12 + 4a) Solving -30 = 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. -30 + -4a = 12 + 4a + -4a Combine like terms: 4a + -4a = 0 -30 + -4a = 12 + 0 -30 + -4a = 12 Add '30' to each side of the equation. -30 + 30 + -4a = 12 + 30 Combine like terms: -30 + 30 = 0 0 + -4a = 12 + 30 -4a = 12 + 30 Combine like terms: 12 + 30 = 42 -4a = 42 Divide each side by '-4'. a = -10.5 Simplifying a = -10.5
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