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Simplifying 2r + -1y = 3(3 + -1r) 2r + -1y = (3 * 3 + -1r * 3) 2r + -1y = (9 + -3r) Solving 2r + -1y = 9 + -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. 2r + 3r + -1y = 9 + -3r + 3r Combine like terms: 2r + 3r = 5r 5r + -1y = 9 + -3r + 3r Combine like terms: -3r + 3r = 0 5r + -1y = 9 + 0 5r + -1y = 9 Add 'y' to each side of the equation. 5r + -1y + y = 9 + y Combine like terms: -1y + y = 0 5r + 0 = 9 + y 5r = 9 + y Divide each side by '5'. r = 1.8 + 0.2y Simplifying r = 1.8 + 0.2y
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