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Simplifying 15a + -4 + -13(a + 2) = 20 Reorder the terms: 15a + -4 + -13(2 + a) = 20 15a + -4 + (2 * -13 + a * -13) = 20 15a + -4 + (-26 + -13a) = 20 Reorder the terms: -4 + -26 + 15a + -13a = 20 Combine like terms: -4 + -26 = -30 -30 + 15a + -13a = 20 Combine like terms: 15a + -13a = 2a -30 + 2a = 20 Solving -30 + 2a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 2a = 20 + 30 Combine like terms: -30 + 30 = 0 0 + 2a = 20 + 30 2a = 20 + 30 Combine like terms: 20 + 30 = 50 2a = 50 Divide each side by '2'. a = 25 Simplifying a = 25
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