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Simplifying 8x + -7z + 400 = 0 Reorder the terms: 400 + 8x + -7z = 0 Solving 400 + 8x + -7z = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-400' to each side of the equation. 400 + 8x + -400 + -7z = 0 + -400 Reorder the terms: 400 + -400 + 8x + -7z = 0 + -400 Combine like terms: 400 + -400 = 0 0 + 8x + -7z = 0 + -400 8x + -7z = 0 + -400 Combine like terms: 0 + -400 = -400 8x + -7z = -400 Add '7z' to each side of the equation. 8x + -7z + 7z = -400 + 7z Combine like terms: -7z + 7z = 0 8x + 0 = -400 + 7z 8x = -400 + 7z Divide each side by '8'. x = -50 + 0.875z Simplifying x = -50 + 0.875z
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