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Simplifying -3r + 2 + 0.8r + -7 = 0 Reorder the terms: 2 + -7 + -3r + 0.8r = 0 Combine like terms: 2 + -7 = -5 -5 + -3r + 0.8r = 0 Combine like terms: -3r + 0.8r = -2.2r -5 + -2.2r = 0 Solving -5 + -2.2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2.2r = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2.2r = 0 + 5 -2.2r = 0 + 5 Combine like terms: 0 + 5 = 5 -2.2r = 5 Divide each side by '-2.2'. r = -2.272727273 Simplifying r = -2.272727273
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