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Simplifying 3a + -1(5a + 7) = 20 Reorder the terms: 3a + -1(7 + 5a) = 20 3a + (7 * -1 + 5a * -1) = 20 3a + (-7 + -5a) = 20 Reorder the terms: -7 + 3a + -5a = 20 Combine like terms: 3a + -5a = -2a -7 + -2a = 20 Solving -7 + -2a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -2a = 20 + 7 Combine like terms: -7 + 7 = 0 0 + -2a = 20 + 7 -2a = 20 + 7 Combine like terms: 20 + 7 = 27 -2a = 27 Divide each side by '-2'. a = -13.5 Simplifying a = -13.5
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