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Simplifying 8 + -3r = 21 + -225 Combine like terms: 21 + -225 = -204 8 + -3r = -204 Solving 8 + -3r = -204 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3r = -204 + -8 Combine like terms: 8 + -8 = 0 0 + -3r = -204 + -8 -3r = -204 + -8 Combine like terms: -204 + -8 = -212 -3r = -212 Divide each side by '-3'. r = 70.66666667 Simplifying r = 70.66666667
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