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Simplifying 7 + -1a = 28 Solving 7 + -1a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1a = 28 + -7 Combine like terms: 7 + -7 = 0 0 + -1a = 28 + -7 -1a = 28 + -7 Combine like terms: 28 + -7 = 21 -1a = 21 Divide each side by '-1'. a = -21 Simplifying a = -21
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