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Simplifying 12x + 15y + 20z = 7 Solving 12x + 15y + 20z = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15y' to each side of the equation. 12x + 15y + -15y + 20z = 7 + -15y Combine like terms: 15y + -15y = 0 12x + 0 + 20z = 7 + -15y 12x + 20z = 7 + -15y Add '-20z' to each side of the equation. 12x + 20z + -20z = 7 + -15y + -20z Combine like terms: 20z + -20z = 0 12x + 0 = 7 + -15y + -20z 12x = 7 + -15y + -20z Divide each side by '12'. x = 0.5833333333 + -1.25y + -1.666666667z Simplifying x = 0.5833333333 + -1.25y + -1.666666667z
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