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Simplifying 3.333r + 3.333(r + -3) = 90 Reorder the terms: 3.333r + 3.333(-3 + r) = 90 3.333r + (-3 * 3.333 + r * 3.333) = 90 3.333r + (-9.999 + 3.333r) = 90 Reorder the terms: -9.999 + 3.333r + 3.333r = 90 Combine like terms: 3.333r + 3.333r = 6.666r -9.999 + 6.666r = 90 Solving -9.999 + 6.666r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9.999' to each side of the equation. -9.999 + 9.999 + 6.666r = 90 + 9.999 Combine like terms: -9.999 + 9.999 = 0.000 0.000 + 6.666r = 90 + 9.999 6.666r = 90 + 9.999 Combine like terms: 90 + 9.999 = 99.999 6.666r = 99.999 Divide each side by '6.666'. r = 15.00135014 Simplifying r = 15.00135014
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