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Simplifying x + -45 + 7r = b Reorder the terms: -45 + 7r + x = b Solving -45 + 7r + x = b Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 7r + 45 + x = 45 + b Reorder the terms: -45 + 45 + 7r + x = 45 + b Combine like terms: -45 + 45 = 0 0 + 7r + x = 45 + b 7r + x = 45 + b Add '-1x' to each side of the equation. 7r + x + -1x = 45 + b + -1x Combine like terms: x + -1x = 0 7r + 0 = 45 + b + -1x 7r = 45 + b + -1x Divide each side by '7'. r = 6.428571429 + 0.1428571429b + -0.1428571429x Simplifying r = 6.428571429 + 0.1428571429b + -0.1428571429x
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