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Simplifying 12x2 + 5r + -7 = 0 Reorder the terms: -7 + 5r + 12x2 = 0 Solving -7 + 5r + 12x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 5r + 7 + 12x2 = 0 + 7 Reorder the terms: -7 + 7 + 5r + 12x2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 5r + 12x2 = 0 + 7 5r + 12x2 = 0 + 7 Combine like terms: 0 + 7 = 7 5r + 12x2 = 7 Add '-12x2' to each side of the equation. 5r + 12x2 + -12x2 = 7 + -12x2 Combine like terms: 12x2 + -12x2 = 0 5r + 0 = 7 + -12x2 5r = 7 + -12x2 Divide each side by '5'. r = 1.4 + -2.4x2 Simplifying r = 1.4 + -2.4x2
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