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Simplifying 4.2r + -7 + 1.8r = 8 Reorder the terms: -7 + 4.2r + 1.8r = 8 Combine like terms: 4.2r + 1.8r = 6r -7 + 6r = 8 Solving -7 + 6r = 8 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 + 7 + 6r = 8 + 7 Combine like terms: -7 + 7 = 0 0 + 6r = 8 + 7 6r = 8 + 7 Combine like terms: 8 + 7 = 15 6r = 15 Divide each side by '6'. r = 2.5 Simplifying r = 2.5
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