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Simplifying 7a + 12 + -9a = 22 Reorder the terms: 12 + 7a + -9a = 22 Combine like terms: 7a + -9a = -2a 12 + -2a = 22 Solving 12 + -2a = 22 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -2a = 22 + -12 Combine like terms: 12 + -12 = 0 0 + -2a = 22 + -12 -2a = 22 + -12 Combine like terms: 22 + -12 = 10 -2a = 10 Divide each side by '-2'. a = -5 Simplifying a = -5
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