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Simplifying 4 + -7a + 15 + -8a + -21 = 0 Reorder the terms: 4 + 15 + -21 + -7a + -8a = 0 Combine like terms: 4 + 15 = 19 19 + -21 + -7a + -8a = 0 Combine like terms: 19 + -21 = -2 -2 + -7a + -8a = 0 Combine like terms: -7a + -8a = -15a -2 + -15a = 0 Solving -2 + -15a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -15a = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -15a = 0 + 2 -15a = 0 + 2 Combine like terms: 0 + 2 = 2 -15a = 2 Divide each side by '-15'. a = -0.1333333333 Simplifying a = -0.1333333333
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