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Simplifying -15 + 3a = 3(7a + -5) Reorder the terms: -15 + 3a = 3(-5 + 7a) -15 + 3a = (-5 * 3 + 7a * 3) -15 + 3a = (-15 + 21a) Add '15' to each side of the equation. -15 + 15 + 3a = -15 + 15 + 21a Combine like terms: -15 + 15 = 0 0 + 3a = -15 + 15 + 21a 3a = -15 + 15 + 21a Combine like terms: -15 + 15 = 0 3a = 0 + 21a 3a = 21a Solving 3a = 21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. 3a + -21a = 21a + -21a Combine like terms: 3a + -21a = -18a -18a = 21a + -21a Combine like terms: 21a + -21a = 0 -18a = 0 Divide each side by '-18'. a = 0 Simplifying a = 0
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