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Simplifying 7 = 12 + 2a Solving 7 = 12 + 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. 7 + -2a = 12 + 2a + -2a Combine like terms: 2a + -2a = 0 7 + -2a = 12 + 0 7 + -2a = 12 Add '-7' to each side of the equation. 7 + -7 + -2a = 12 + -7 Combine like terms: 7 + -7 = 0 0 + -2a = 12 + -7 -2a = 12 + -7 Combine like terms: 12 + -7 = 5 -2a = 5 Divide each side by '-2'. a = -2.5 Simplifying a = -2.5
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