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Simplifying -8x + 7y + z = 21 Solving -8x + 7y + z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7y' to each side of the equation. -8x + 7y + -7y + z = 21 + -7y Combine like terms: 7y + -7y = 0 -8x + 0 + z = 21 + -7y -8x + z = 21 + -7y Add '-1z' to each side of the equation. -8x + z + -1z = 21 + -7y + -1z Combine like terms: z + -1z = 0 -8x + 0 = 21 + -7y + -1z -8x = 21 + -7y + -1z Divide each side by '-8'. x = -2.625 + 0.875y + 0.125z Simplifying x = -2.625 + 0.875y + 0.125z
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