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Simplifying 20 + -7a = 3a + -20 Reorder the terms: 20 + -7a = -20 + 3a Solving 20 + -7a = -20 + 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 = -20 + 3a + -3a Combine like terms: -7a + -3a = -10a 20 + -10a = -20 + 3a + -3a Combine like terms: 3a + -3a = 0 20 + -10a = -20 + 0 20 + -10a = -20 Add '-20' to each side of the equation. 20 + -20 + -10a = -20 + -20 Combine like terms: 20 + -20 = 0 0 + -10a = -20 + -20 -10a = -20 + -20 Combine like terms: -20 + -20 = -40 -10a = -40 Divide each side by '-10'. a = 4 Simplifying a = 4
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