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Simplifying 7x + 7 + 3z + -7 = 90 Reorder the terms: 7 + -7 + 7x + 3z = 90 Combine like terms: 7 + -7 = 0 0 + 7x + 3z = 90 7x + 3z = 90 Solving 7x + 3z = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3z' to each side of the equation. 7x + 3z + -3z = 90 + -3z Combine like terms: 3z + -3z = 0 7x + 0 = 90 + -3z 7x = 90 + -3z Divide each side by '7'. x = 12.85714286 + -0.4285714286z Simplifying x = 12.85714286 + -0.4285714286z
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