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Simplifying 4x + -3y + -7z = 31 Solving 4x + -3y + -7z = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3y' to each side of the equation. 4x + -3y + 3y + -7z = 31 + 3y Combine like terms: -3y + 3y = 0 4x + 0 + -7z = 31 + 3y 4x + -7z = 31 + 3y Add '7z' to each side of the equation. 4x + -7z + 7z = 31 + 3y + 7z Combine like terms: -7z + 7z = 0 4x + 0 = 31 + 3y + 7z 4x = 31 + 3y + 7z Divide each side by '4'. x = 7.75 + 0.75y + 1.75z Simplifying x = 7.75 + 0.75y + 1.75z
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