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Simplifying -28 + -7a = 63 Solving -28 + -7a = 63 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -7a = 63 + 28 Combine like terms: -28 + 28 = 0 0 + -7a = 63 + 28 -7a = 63 + 28 Combine like terms: 63 + 28 = 91 -7a = 91 Divide each side by '-7'. a = -13 Simplifying a = -13
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