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Simplifying -2.1(r + 2) + 0.7r = 0 Reorder the terms: -2.1(2 + r) + 0.7r = 0 (2 * -2.1 + r * -2.1) + 0.7r = 0 (-4.2 + -2.1r) + 0.7r = 0 Combine like terms: -2.1r + 0.7r = -1.4r -4.2 + -1.4r = 0 Solving -4.2 + -1.4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4.2' to each side of the equation. -4.2 + 4.2 + -1.4r = 0 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + -1.4r = 0 + 4.2 -1.4r = 0 + 4.2 Combine like terms: 0 + 4.2 = 4.2 -1.4r = 4.2 Divide each side by '-1.4'. r = -3 Simplifying r = -3
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