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Simplifying 390 = 55r + 75r Combine like terms: 55r + 75r = 130r 390 = 130r Solving 390 = 130r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-130r' to each side of the equation. 390 + -130r = 130r + -130r Combine like terms: 130r + -130r = 0 390 + -130r = 0 Add '-390' to each side of the equation. 390 + -390 + -130r = 0 + -390 Combine like terms: 390 + -390 = 0 0 + -130r = 0 + -390 -130r = 0 + -390 Combine like terms: 0 + -390 = -390 -130r = -390 Divide each side by '-130'. r = 3 Simplifying r = 3
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