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Simplifying a + -3(5a + -4) = 21 Reorder the terms: a + -3(-4 + 5a) = 21 a + (-4 * -3 + 5a * -3) = 21 a + (12 + -15a) = 21 Reorder the terms: 12 + a + -15a = 21 Combine like terms: a + -15a = -14a 12 + -14a = 21 Solving 12 + -14a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -14a = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -14a = 21 + -12 -14a = 21 + -12 Combine like terms: 21 + -12 = 9 -14a = 9 Divide each side by '-14'. a = -0.6428571429 Simplifying a = -0.6428571429
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