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Simplifying -20 + -7a = 3a + 12 Reorder the terms: -20 + -7a = 12 + 3a Solving -20 + -7a = 12 + 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. -20 + -7a + -3a = 12 + 3a + -3a Combine like terms: -7a + -3a = -10a -20 + -10a = 12 + 3a + -3a Combine like terms: 3a + -3a = 0 -20 + -10a = 12 + 0 -20 + -10a = 12 Add '20' to each side of the equation. -20 + 20 + -10a = 12 + 20 Combine like terms: -20 + 20 = 0 0 + -10a = 12 + 20 -10a = 12 + 20 Combine like terms: 12 + 20 = 32 -10a = 32 Divide each side by '-10'. a = -3.2 Simplifying a = -3.2
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