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Simplifying 12 + -7a = 2a + 30 Reorder the terms: 12 + -7a = 30 + 2a Solving 12 + -7a = 30 + 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. 12 + -7a + -2a = 30 + 2a + -2a Combine like terms: -7a + -2a = -9a 12 + -9a = 30 + 2a + -2a Combine like terms: 2a + -2a = 0 12 + -9a = 30 + 0 12 + -9a = 30 Add '-12' to each side of the equation. 12 + -12 + -9a = 30 + -12 Combine like terms: 12 + -12 = 0 0 + -9a = 30 + -12 -9a = 30 + -12 Combine like terms: 30 + -12 = 18 -9a = 18 Divide each side by '-9'. a = -2 Simplifying a = -2
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