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Simplifying 3(20 + -1a) = 7a (20 * 3 + -1a * 3) = 7a (60 + -3a) = 7a Solving 60 + -3a = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 60 + -3a + -7a = 7a + -7a Combine like terms: -3a + -7a = -10a 60 + -10a = 7a + -7a Combine like terms: 7a + -7a = 0 60 + -10a = 0 Add '-60' to each side of the equation. 60 + -60 + -10a = 0 + -60 Combine like terms: 60 + -60 = 0 0 + -10a = 0 + -60 -10a = 0 + -60 Combine like terms: 0 + -60 = -60 -10a = -60 Divide each side by '-10'. a = 6 Simplifying a = 6
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