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Simplifying 9z + 4z + -2r = 0 Reorder the terms: -2r + 9z + 4z = 0 Combine like terms: 9z + 4z = 13z -2r + 13z = 0 Solving -2r + 13z = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13z' to each side of the equation. -2r + 13z + -13z = 0 + -13z Combine like terms: 13z + -13z = 0 -2r + 0 = 0 + -13z -2r = 0 + -13z Remove the zero: -2r = -13z Divide each side by '-2'. r = 6.5z Simplifying r = 6.5z
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