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Simplifying 15 + -3a = 3 + -7a Solving 15 + -3a = 3 + -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 + -3a + 7a = 3 + -7a + 7a Combine like terms: -3a + 7a = 4a 15 + 4a = 3 + -7a + 7a Combine like terms: -7a + 7a = 0 15 + 4a = 3 + 0 15 + 4a = 3 Add '-15' to each side of the equation. 15 + -15 + 4a = 3 + -15 Combine like terms: 15 + -15 = 0 0 + 4a = 3 + -15 4a = 3 + -15 Combine like terms: 3 + -15 = -12 4a = -12 Divide each side by '4'. a = -3 Simplifying a = -3
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