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Simplifying -2a + -15 + 11a + -1(-13a) + -10a = 12 Remove parenthesis around (-13a) -2a + -15 + 11a + -1 * -13a + -10a = 12 Multiply -1 * -13 -2a + -15 + 11a + 13a + -10a = 12 Reorder the terms: -15 + -2a + 11a + 13a + -10a = 12 Combine like terms: -2a + 11a = 9a -15 + 9a + 13a + -10a = 12 Combine like terms: 9a + 13a = 22a -15 + 22a + -10a = 12 Combine like terms: 22a + -10a = 12a -15 + 12a = 12 Solving -15 + 12a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 12a = 12 + 15 Combine like terms: -15 + 15 = 0 0 + 12a = 12 + 15 12a = 12 + 15 Combine like terms: 12 + 15 = 27 12a = 27 Divide each side by '12'. a = 2.25 Simplifying a = 2.25
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