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Simplifying 12 + -2a = 15 + -7a Solving 12 + -2a = 15 + -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. 12 + -2a + 7a = 15 + -7a + 7a Combine like terms: -2a + 7a = 5a 12 + 5a = 15 + -7a + 7a Combine like terms: -7a + 7a = 0 12 + 5a = 15 + 0 12 + 5a = 15 Add '-12' to each side of the equation. 12 + -12 + 5a = 15 + -12 Combine like terms: 12 + -12 = 0 0 + 5a = 15 + -12 5a = 15 + -12 Combine like terms: 15 + -12 = 3 5a = 3 Divide each side by '5'. a = 0.6 Simplifying a = 0.6
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