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Simplifying -4(a + -8) + -7a = 87 Reorder the terms: -4(-8 + a) + -7a = 87 (-8 * -4 + a * -4) + -7a = 87 (32 + -4a) + -7a = 87 Combine like terms: -4a + -7a = -11a 32 + -11a = 87 Solving 32 + -11a = 87 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-32' to each side of the equation. 32 + -32 + -11a = 87 + -32 Combine like terms: 32 + -32 = 0 0 + -11a = 87 + -32 -11a = 87 + -32 Combine like terms: 87 + -32 = 55 -11a = 55 Divide each side by '-11'. a = -5 Simplifying a = -5
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