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Simplifying -21x2 + 70r + 84 = 0 Reorder the terms: 84 + 70r + -21x2 = 0 Solving 84 + 70r + -21x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + 70r + -84 + -21x2 = 0 + -84 Reorder the terms: 84 + -84 + 70r + -21x2 = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 70r + -21x2 = 0 + -84 70r + -21x2 = 0 + -84 Combine like terms: 0 + -84 = -84 70r + -21x2 = -84 Add '21x2' to each side of the equation. 70r + -21x2 + 21x2 = -84 + 21x2 Combine like terms: -21x2 + 21x2 = 0 70r + 0 = -84 + 21x2 70r = -84 + 21x2 Divide each side by '70'. r = -1.2 + 0.3x2 Simplifying r = -1.2 + 0.3x2
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