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Simplifying 7a + -3 = 15 + -2a Reorder the terms: -3 + 7a = 15 + -2a Solving -3 + 7a = 15 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -3 + 7a + 2a = 15 + -2a + 2a Combine like terms: 7a + 2a = 9a -3 + 9a = 15 + -2a + 2a Combine like terms: -2a + 2a = 0 -3 + 9a = 15 + 0 -3 + 9a = 15 Add '3' to each side of the equation. -3 + 3 + 9a = 15 + 3 Combine like terms: -3 + 3 = 0 0 + 9a = 15 + 3 9a = 15 + 3 Combine like terms: 15 + 3 = 18 9a = 18 Divide each side by '9'. a = 2 Simplifying a = 2
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