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Simplifying (7x + 9y) + 3z = 0 Remove parenthesis around (7x + 9y) 7x + 9y + 3z = 0 Solving 7x + 9y + 3z = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9y' to each side of the equation. 7x + 9y + -9y + 3z = 0 + -9y Combine like terms: 9y + -9y = 0 7x + 0 + 3z = 0 + -9y 7x + 3z = 0 + -9y Remove the zero: 7x + 3z = -9y Add '-3z' to each side of the equation. 7x + 3z + -3z = -9y + -3z Combine like terms: 3z + -3z = 0 7x + 0 = -9y + -3z 7x = -9y + -3z Divide each side by '7'. x = -1.285714286y + -0.4285714286z Simplifying x = -1.285714286y + -0.4285714286z
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