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Simplifying 2r + 90 = 3r + 10 Reorder the terms: 90 + 2r = 3r + 10 Reorder the terms: 90 + 2r = 10 + 3r Solving 90 + 2r = 10 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 90 + 2r + -3r = 10 + 3r + -3r Combine like terms: 2r + -3r = -1r 90 + -1r = 10 + 3r + -3r Combine like terms: 3r + -3r = 0 90 + -1r = 10 + 0 90 + -1r = 10 Add '-90' to each side of the equation. 90 + -90 + -1r = 10 + -90 Combine like terms: 90 + -90 = 0 0 + -1r = 10 + -90 -1r = 10 + -90 Combine like terms: 10 + -90 = -80 -1r = -80 Divide each side by '-1'. r = 80 Simplifying r = 80
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