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Simplifying 4r + -7 = 18 + -1r Reorder the terms: -7 + 4r = 18 + -1r Solving -7 + 4r = 18 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -7 + 4r + r = 18 + -1r + r Combine like terms: 4r + r = 5r -7 + 5r = 18 + -1r + r Combine like terms: -1r + r = 0 -7 + 5r = 18 + 0 -7 + 5r = 18 Add '7' to each side of the equation. -7 + 7 + 5r = 18 + 7 Combine like terms: -7 + 7 = 0 0 + 5r = 18 + 7 5r = 18 + 7 Combine like terms: 18 + 7 = 25 5r = 25 Divide each side by '5'. r = 5 Simplifying r = 5
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