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Simplifying 8a + -15 = 21 + -7a Reorder the terms: -15 + 8a = 21 + -7a Solving -15 + 8a = 21 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. -15 + 8a + 7a = 21 + -7a + 7a Combine like terms: 8a + 7a = 15a -15 + 15a = 21 + -7a + 7a Combine like terms: -7a + 7a = 0 -15 + 15a = 21 + 0 -15 + 15a = 21 Add '15' to each side of the equation. -15 + 15 + 15a = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 15a = 21 + 15 15a = 21 + 15 Combine like terms: 21 + 15 = 36 15a = 36 Divide each side by '15'. a = 2.4 Simplifying a = 2.4
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