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Simplifying 250 = 100 + r Solving 250 = 100 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 250 + -1r = 100 + r + -1r Combine like terms: r + -1r = 0 250 + -1r = 100 + 0 250 + -1r = 100 Add '-250' to each side of the equation. 250 + -250 + -1r = 100 + -250 Combine like terms: 250 + -250 = 0 0 + -1r = 100 + -250 -1r = 100 + -250 Combine like terms: 100 + -250 = -150 -1r = -150 Divide each side by '-1'. r = 150 Simplifying r = 150
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