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Simplifying 20 + -1a = 7a + -4a + 4 Reorder the terms: 20 + -1a = 4 + 7a + -4a Combine like terms: 7a + -4a = 3a 20 + -1a = 4 + 3a Solving 20 + -1a = 4 + 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 + -1a + -3a = 4 + 3a + -3a Combine like terms: -1a + -3a = -4a 20 + -4a = 4 + 3a + -3a Combine like terms: 3a + -3a = 0 20 + -4a = 4 + 0 20 + -4a = 4 Add '-20' to each side of the equation. 20 + -20 + -4a = 4 + -20 Combine like terms: 20 + -20 = 0 0 + -4a = 4 + -20 -4a = 4 + -20 Combine like terms: 4 + -20 = -16 -4a = -16 Divide each side by '-4'. a = 4 Simplifying a = 4
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