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Simplifying 30x + 4y + 9z = 70 Solving 30x + 4y + 9z = 70 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4y' to each side of the equation. 30x + 4y + -4y + 9z = 70 + -4y Combine like terms: 4y + -4y = 0 30x + 0 + 9z = 70 + -4y 30x + 9z = 70 + -4y Add '-9z' to each side of the equation. 30x + 9z + -9z = 70 + -4y + -9z Combine like terms: 9z + -9z = 0 30x + 0 = 70 + -4y + -9z 30x = 70 + -4y + -9z Divide each side by '30'. x = 2.333333333 + -0.1333333333y + -0.3z Simplifying x = 2.333333333 + -0.1333333333y + -0.3z
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