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Simplifying 3r + 6st + 5r + 3st + -7st = 0 Reorder the terms: 3r + 5r + 6st + 3st + -7st = 0 Combine like terms: 3r + 5r = 8r 8r + 6st + 3st + -7st = 0 Combine like terms: 6st + 3st = 9st 8r + 9st + -7st = 0 Combine like terms: 9st + -7st = 2st 8r + 2st = 0 Solving 8r + 2st = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2st' to each side of the equation. 8r + 2st + -2st = 0 + -2st Combine like terms: 2st + -2st = 0 8r + 0 = 0 + -2st 8r = 0 + -2st Remove the zero: 8r = -2st Divide each side by '8'. r = -0.25st Simplifying r = -0.25st

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