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Simplifying -21 + -8a = -1 + 6(4 + -5) Combine like terms: 4 + -5 = -1 -21 + -8a = -1 + 6(-1) Multiply 6 * -1 -21 + -8a = -1 + -6 Combine like terms: -1 + -6 = -7 -21 + -8a = -7 Solving -21 + -8a = -7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -8a = -7 + 21 Combine like terms: -21 + 21 = 0 0 + -8a = -7 + 21 -8a = -7 + 21 Combine like terms: -7 + 21 = 14 -8a = 14 Divide each side by '-8'. a = -1.75 Simplifying a = -1.75
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