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Simplifying -10x + 7 + 9y + -10r + 80 = 0 Reorder the terms: 7 + 80 + -10r + -10x + 9y = 0 Combine like terms: 7 + 80 = 87 87 + -10r + -10x + 9y = 0 Solving 87 + -10r + -10x + 9y = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-87' to each side of the equation. 87 + -10r + -10x + -87 + 9y = 0 + -87 Reorder the terms: 87 + -87 + -10r + -10x + 9y = 0 + -87 Combine like terms: 87 + -87 = 0 0 + -10r + -10x + 9y = 0 + -87 -10r + -10x + 9y = 0 + -87 Combine like terms: 0 + -87 = -87 -10r + -10x + 9y = -87 Add '10x' to each side of the equation. -10r + -10x + 10x + 9y = -87 + 10x Combine like terms: -10x + 10x = 0 -10r + 0 + 9y = -87 + 10x -10r + 9y = -87 + 10x Add '-9y' to each side of the equation. -10r + 9y + -9y = -87 + 10x + -9y Combine like terms: 9y + -9y = 0 -10r + 0 = -87 + 10x + -9y -10r = -87 + 10x + -9y Divide each side by '-10'. r = 8.7 + -1x + 0.9y Simplifying r = 8.7 + -1x + 0.9y
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