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Simplifying -12 + -1a = 4a + -7 Reorder the terms: -12 + -1a = -7 + 4a Solving -12 + -1a = -7 + 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. -12 + -1a + -4a = -7 + 4a + -4a Combine like terms: -1a + -4a = -5a -12 + -5a = -7 + 4a + -4a Combine like terms: 4a + -4a = 0 -12 + -5a = -7 + 0 -12 + -5a = -7 Add '12' to each side of the equation. -12 + 12 + -5a = -7 + 12 Combine like terms: -12 + 12 = 0 0 + -5a = -7 + 12 -5a = -7 + 12 Combine like terms: -7 + 12 = 5 -5a = 5 Divide each side by '-5'. a = -1 Simplifying a = -1
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