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Simplifying 90 + -2.50 = r Combine like terms: 90 + -2.50 = 87.5 87.5 = r Solving 87.5 = 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. 87.5 + -1r = r + -1r Combine like terms: r + -1r = 0 87.5 + -1r = 0 Add '-87.5' to each side of the equation. 87.5 + -87.5 + -1r = 0 + -87.5 Combine like terms: 87.5 + -87.5 = 0.0 0.0 + -1r = 0 + -87.5 -1r = 0 + -87.5 Combine like terms: 0 + -87.5 = -87.5 -1r = -87.5 Divide each side by '-1'. r = 87.5 Simplifying r = 87.5
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